Best Supplements for Weight Loss 2026(Backed By Science)

According to CDC in early 2026, about 74% of adults in the United States struggles with weight management However, If you want the best supplements for weight loss, look for ones backed by science and safe dosages.

This guide focuses on beginner-friendly, safe weight loss supplements backed by clinical research that help control appetite, boost metabolism, support gut health, and improve mitochondrial function.

Fat burning supplements 2026 offer both stimulant and non-stimulant options. You can find appetite suppressants, carb-targeting aids, probiotics for gut health, metabolism boosters, and mitochondrial enhancers. Use them with a calorie-aware diet, strength training, good sleep, and medical advice for the best results.

Below, you'll find evidence-focused choices and practical tips. This will help you pick weight loss supplements that work without risking your safety. Remember, supplements support your effort, but they don't replace it.

Key Takeaways

Choose supplements with human clinical data and third-party testing for safety.
Combine foundational nutrients (vitamin D, probiotics) with targeted aids for appetite or metabolism.
Fat burning supplements 2026 cover both stimulant and non-stimulant mechanisms—know the trade-offs.
Weight loss supplements that work are tools, not magic; pair them with diet, exercise, and sleep.
Start low, monitor response, and consult a clinician before combining multiple products.

How to use weight loss supplements safely and what to expect

First, understand if supplements work and which ones are safe. They should be used with diet and exercise. Look for products backed by science and approved by doctors.

Yes, weight loss supplements can help many people. But, they work best when combined with diet and exercise. For beginners, start with basic supplements like vitamin D3 and probiotics.

How supplements support weight loss

Supplements can reduce hunger, slow carb absorption, and boost metabolism. They can also support gut and cellular health. This can lead to weight loss.

Appetite suppressants and carb-blockers work quickly. Probiotics and mitochondrial support take longer. Think of these as small steps to a healthier you.

Realistic expectations and timeframe

Set realistic weight loss goals. Aim for 0.5–2 pounds per week. Supplements like appetite-control or carb-targeted ones may show results in days to weeks.

Probiotics, NAD+-support, or mitochondrial supplements take 4–12 weeks to show effects. Thermogenic formulas can lead to small daily energy increases over weeks.

Safety considerations and when to talk to a clinician

Get baseline lab tests before starting supplements. This includes vitamin D and thyroid tests. Joe Rogan and others recommend bloodwork and doctor advice for advanced supplements.

Be careful with supplements and medications. Avoid high doses of untested products. If you experience side effects, stop and see a doctor.

Stick to well-studied supplements for beginners. Discuss any changes with your doctor. Avoid experimental products without medical guidance.

Goal	Typical Supplement Type	Expected Timeline	Beginner Friendly?
Appetite control	Fiber blends, glucomannan, low-dose prescription options	Days to weeks	Yes
Carb-targeting	Alpha-amylase inhibitors, white kidney bean, enzyme blends	Days to weeks	Yes
Metabolic boost	Caffeine, green tea extract, thermogenics	Weeks	With caution
Gut and inflammation	Probiotics, prebiotic fiber	4–12 weeks	Yes
Cellular energy	NAD+ precursors like NMN, mitochondrial support blends	4–12 weeks	Discuss with clinician
Fast visible results	Prescription agents, aggressive thermogenics	Days to weeks	No, higher risk

Leanbliss - weight loss and blood sugar control (natural support for carb lovers)

Leanbliss helps manage blood sugar spikes after meals and supports steady weight loss. It combines compounds for blood sugar control with fibers and polyphenols. These slow down carb absorption. It's great for those who love pasta, rice, bread, or sugary treats.

What Leanbliss is and how it works

Leanbliss has berberine, cinnamon extract, chromium, alpha-lipoic acid, bitter melon, and soluble fiber. These ingredients work in different ways. Some improve insulin sensitivity. Others slow down carb digestion. Some also reduce hunger after eating carbs.

Evidence and mechanisms

Studies show berberine and chromium can lower fasting glucose and spikes after meals. Alpha-lipoic acid helps with insulin signaling. Fiber and polyphenols slow down glucose absorption. Together, they help manage blood sugar spikes after carb-heavy meals.

Who should consider Leanbliss

If you often eat carbs, feel tired after meals, or have insulin resistance, Leanbliss might be for you. It works well with multivitamins or probiotics. But, don't stop taking diabetes drugs without talking to your doctor.

Pros and cons

Pros: Helps control blood sugar spikes, may reduce hunger after carbs, and supports weight loss and metabolic health. It's a good addition to a weight loss plan.
Cons: May interact with diabetes meds, can cause stomach issues, and effects vary. It's not a single solution for fat loss and should be part of a broader approach.

SlimSana – appetite control supplement (best appetite suppressant supplements)

SlimSana uses a blend of soluble fiber, amino precursors, and herbal extracts to help you eat less. It's meant to be used alongside a balanced diet and regular exercise. Many people find they eat fewer snacks and smaller meals within days or weeks.

How appetite suppressants work

Soluble fibers like glucomannan expand in your stomach, making you feel full. Other ingredients work on hunger hormones like ghrelin and serotonin. This helps you stay satisfied for longer.

Key ingredients and the science

Glucomannan is the main fiber in SlimSana, backed by research. It can help you eat fewer calories. 5-HTP boosts serotonin precursors, which may reduce carb cravings. Green tea and saffron extracts offer additional support.

Use cases for beginners and practical dosing tips

Start with a low dose if you're new to supplements. Begin with 1 g of glucomannan before meals with water. Increase as needed. Take 5-HTP at night to improve sleep and mood. Pair it with enough protein and a multivitamin for best results.

You might notice less snacking and smaller meals in a few days. Monitor how your body reacts. If you experience bloating or constipation, reduce the dose or stop.

Pros and cons

Pros: SlimSana can help control cravings and reduce calorie intake. It's great for beginners or those starting a new exercise routine. Combining it with protein and steady habits can lead to faster results.

Cons: You might experience stomach issues like gas or bloating. Be careful with glucomannan and water. Results can vary, so it might not work for everyone.

Always follow the recommended doses and drink plenty of water. If you have health concerns or take certain medications, talk to your doctor first.

Leanbiome - best probiotics supplement for weightloss (gut-focused weight loss supplements)

Leanbiome focuses on gut health for better body shape and digestion. It uses science-backed strains to reduce bloating, improve regularity, and balance metabolism. Think of probiotics as part of a bigger plan that includes diet, exercise, and sleep.

Role of the microbiome in weight regulation

Your gut microbiome breaks down food, controls inflammation, and sends hunger signals. If good bacteria are low, you might feel bloated, have slow digestion, or crave junk food. Balancing your gut can help you absorb nutrients better and reduce inflammation, which can help with weight.

Strains and evidence for weight outcomes

Look for strains with human studies backing them. Akkermansia muciniphila is linked to better metabolism, Lactobacillus gasseri to less belly fat, and Bifidobacterium lactis to better stool. Brands like Seed and Onnit use multi-strain formulas with prebiotics to help good bacteria grow.

When probiotics help reduce belly fat and bloating

If you often feel bloated or have irregular bowel movements, probiotics can help. You might see a small decrease in belly size in 8–12 weeks. But results can vary based on your starting gut health and the supplement you choose.

Pros and cons

Pros: Improves digestion, reduces bloating, and supports metabolic health when used with healthy habits.
Cons: Effects vary by strain and person. Some might experience temporary digestive issues. While probiotics can help, long-term weight loss evidence is still limited.

Use Leanbiome or the best probiotics supplement for weightloss with healthy eating and targeted herbal supplements. This way, your gut gets the best support for weight and comfort without relying on just one product.

Exoburn – best metabolism support supplement (thermogenic and metabolism booster supplements)

Exoburn is designed to help you burn more calories and work out harder. It can slightly increase your resting metabolic rate when used with exercise and diet. It's a top choice for boosting metabolism to lose weight, thanks to its effective ingredients and easy-to-follow dosages.

How metabolism boosters and thermogenics work

Metabolism boosters increase your energy use by a small amount. Thermogenic supplements, on the other hand, slightly raise your metabolic rate. They also help your body use more fat during exercise.

These effects are not huge on their own. The best results come when you use a thermogenic product with your workouts.

Common active ingredients and clinical data

Ingredients like caffeine, green tea extract, capsaicin, green coffee extract, and yohimbine are often used. Studies show that green tea and caffeine together can lead to small weight and fat loss over time.

Capsaicin can also increase your metabolic rate and slightly reduce hunger. Green coffee extract has been shown to help with weight loss when used consistently. The best results come from using a combination of ingredients at the right doses.

Safety notes for stimulants and thermogenic blends

Stimulant-based thermogenic supplements can increase your heart rate and blood pressure. They might cause jitters, anxiety, or trouble sleeping if taken too late in the day.

Stay away from these products if you have heart disease, high blood pressure, or are sensitive to caffeine. Start with a small dose on a non-training day to see how you react.

Pros and cons

Pros include burning more calories, better workout energy, and working well with diet and exercise. Natural ingredients like green tea and capsaicin offer proven, gentle benefits.

Cons are the side effects from stimulants, tolerance with long-term use, and small weight loss when used alone. Remember, Exoburn and similar products are tools, not magic solutions.

Feature	What to expect	Who benefits most
Primary action	Raises metabolic rate slightly; increases fat oxidation during activity	Active adults who exercise regularly
Typical ingredients	Caffeine, green tea extract (EGCG), capsaicin, green coffee extract, yohimbine	People preferring evidence-backed thermogenic supplements
Effect size	Small to moderate over weeks to months when combined with diet and exercise	Those aiming for steady, sustainable fat loss
Safety considerations	May increase heart rate, blood pressure, anxiety, and impair sleep if misused	Avoid if you have heart disease, uncontrolled hypertension, or stimulant sensitivity
Practical tips	Start with low dose, avoid late-day use, combine with workouts and protein-rich meals	Beginners and experienced users seeking the best metabolism booster for weight loss
Pros	Boosts daily calorie burn, raises workout intensity, contains natural fat burners	People who want extra support without prescription drugs
Cons	Stimulant side effects, tolerance, modest standalone impact	Those expecting rapid or dramatic changes without lifestyle changes

Mitolyn - mitochondrial support (cellular energy and metabolic health)

Mitolyn aims to boost your cells' energy by focusing on mitochondria. These tiny power plants inside each cell are crucial. If you often feel tired, recover slowly after workouts, or notice metabolic changes with age, these supplements might help.

Why mitochondrial support matters for weight and energy

Healthy mitochondria help you burn fuel efficiently. When they don't work well, you might feel tired, move less, and burn fewer calories. Supplements can help you stay active and recover faster from exercise.

Scientific basis: NAD+ precursors, NMN context, and cellular energy

NAD+ supplements and precursors like NMN are key in cellular metabolism. Studies show they can improve energy and slow aging. Older adults may see better physical function and younger epigenetic age after using NMN for a year.

Real-world use cases and who benefits

People seeking steady energy, quick recovery, or help with metabolic decline use these supplements. Athletes and older adults often see benefits. But, talk to a doctor before trying IV NAD+ or high-dose NMN.

Pros and cons

Pros: Mitolyn and similar supplements can enhance energy and recovery. This helps you stay active and support your metabolism. Cons: They can be expensive, take weeks to months to show effects, and have limited long-term human data for weight loss.

Aspect	What to expect	Notes
Primary target	Improve mitochondrial function and NAD+ levels	Focuses on cellular pathways that influence energy and repair
Key ingredients	NMN, NAD+ precursors, supporting cofactors	Often paired with resveratrol, B vitamins, and antioxidants
Typical users	Older adults, athletes, low-energy individuals	Best under clinical oversight for advanced protocols
Time to effect	Weeks to months	Longer trials report functional and epigenetic changes
Cost	Moderate to high	High-dose or IV therapies increase expense
Weight loss evidence	Indirect support via improved activity and recovery	NMN for weight loss remains promising but not definitive
Safety	Well tolerated in many trials; specialized oversight advised	Discuss with a healthcare provider before starting

AmylGuard - best weight loss supplement for carb lovers (starch and carb-blocking support)

If you love pasta, rice, or bread, AmylGuard is for you. It uses white kidney bean extract, soluble fiber, and plant polyphenols. These ingredients slow down starch digestion. It's part of a plan that includes eating less and adding protein to your meals.

How carb-targeted supplements work

Alpha-amylase inhibitors from white kidney bean extract block enzymes that break starch into sugar. Soluble fibers add bulk, slow down digestion, and lower blood sugar spikes. Plant polyphenols also slow down carbohydrate breakdown and absorption. Taking it before a starchy meal can help lower blood sugar spikes.

Evidence for reduced post-meal glucose spikes and appetite control

Studies on white kidney bean extract show it can reduce carb absorption and help with weight loss. Fiber is proven to lower blood sugar spikes and make you feel full. But, how well it works can vary based on the product and dose.

Best practices when you eat high-carb meals

Take AmylGuard or similar supplements before a big carb meal. Eat lean protein and veggies with it to stay full and eat less. Watch your portion sizes and don't overeat just because you're taking a supplement. If you experience digestive issues, adjust the timing or dose.

Pros and cons

Pros: May reduce starch digestion, lower post-meal glucose spikes, and support appetite control when paired with calorie awareness.
Cons: GI upset is possible, effectiveness varies across individuals, and interactions with blood sugar medications can occur. Consult your clinician if you take diabetes drugs.

Vitalean, Sleeplean, Calmlean, Lavaslim - comprehensive stack for weight, sleep, stress, and metabolic support

Creating a multi-product supplement stack can tackle several weight-related issues at once. Poor sleep and stress can increase hunger and slow progress. A well-thought-out stack combines sleep, stress, metabolic, and nutritional support. This helps you recover better, control cravings, and maintain energy during workouts.

Why a multi-product approach can help beginners

Starting with one product makes it easier to see benefits and side effects. You can add more products after getting used to them. This method reduces overlap and helps you understand what affects hunger, energy, and body shape.

Sleeplean: relationship between sleep quality and weight

Sleep impacts hormones like leptin and ghrelin, and insulin sensitivity. Supplements with magnesium, L-theanine, and apigenin can improve sleep quality. Better sleep reduces cravings and aids in recovery from exercise. Use sleep supplements for weight loss only at night and avoid stimulants six hours before bed.

Calmlean: stress, cortisol, and appetite control

Stress can lead to overeating. Adaptogens like ashwagandha and calming amino acids can reduce stress-driven cravings. This can lower emotional eating and help stick to your diet. These supplements work best with stress management practices like breathing exercises.

Lavaslim: thermogenic and fat-burning components

Lavaslim combines caffeine, green tea extract, and capsaicin to boost metabolism during activity. For many women, a targeted thermogenic enhances workout effects. When looking for the best fat burner for women, choose a formula with moderate caffeine and botanical extracts to avoid jitters.

How to combine supplements safely and timing tips

Start each product one at a time for three to seven days. Place stimulant-based formulas like Lavaslim in the morning or pre-workout. Take Sleeplean at night. Use Calmlean during stressful times or as a daily adaptogen if tolerated well. Be cautious of overlapping vitamins, iron, or high-dose herbs to avoid excess.

Pros and cons for each product in the stack

Pros: a multi-product stack targets sleep, stress, appetite, and metabolism at once. This broad approach aligns with clinical advice for better results.

Cons: the cost increases with more products. It becomes harder to identify which product causes side effects. Mixing stimulants, sedatives, or prescription medicines can lead to interactions. Always consult a healthcare professional before combining formulas and keep a log of timing and effects.

Featured modern supplement option: evidence-based probiotic or exogenous ketones (what’s new in 2026)

New tools are coming for weight and metabolic care. You can mix targeted microbiome therapies with short-term metabolic fuels. These tools help with focus, appetite, and metabolic flexibility. They're not magic, but they help when used with diet and exercise.

Why include a modern option

A modern option helps you compare new approaches to old ones like fat burning pills 2026. A single probiotic strain can change gut signals affecting hunger and glucose handling over weeks. Exogenous ketones give a quick ketone boost for mental clarity on fasting days or before workouts.

Evidence snapshot: exogenous ketones and metabolic effects

Studies from 2025–2026 show ketone salts and esters raise ketones and reduce mental fatigue. They link temporary ketone elevation to lower oxidative stress and better focus during fasting or low-carb periods. Next-gen probiotics, like Akkermansia-related strains, show modest shifts in metabolic markers and body composition over months.

Practical use cases

Pre-workout: take ketone supplements for mental clarity and steady energy on lower-carb days.
Fasting days: use exogenous ketones 2026 to reduce hunger and support focus while fasting.
Gut-first approach: try an evidence-based probiotic for 8–12 weeks to nudge microbiome composition and support long-term metabolic health.
Stacking: combine short-term ketone use with probiotics to cover both acute cognitive needs and slow metabolic adaptation.

Safety considerations and pros/cons

Option	Short-term benefits	Common downsides
Exogenous ketones	Rapid ketone rise, improved focus, aids fasting and workouts	GI upset, electrolyte shifts, cost; not a standalone weight-loss solution
Evidence-based probiotic	Gradual metabolic and gut improvements, reduced bloating for some users	Effects strain-dependent; benefits vary by baseline microbiome

See exogenous ketones 2026 and modern weight loss supplements as tools with clear roles. If you use fat burning pills 2026, compare safety and evidence before stacking. Always talk with your clinician if you have chronic conditions or take medication that affects electrolytes or glucose.

How to choose the safest weight loss supplements (clinically proven, beginner-friendly guidance)

Choosing supplements can be tough. Start with a simple checklist to stay safe and focused. Look for clear labels and human trial data to spot the real deals from the fake ones.

Checklist for quality

Look for third-party tested supplements with seals from USP or NSF.
Choose supplements that list full ingredient amounts and avoid hidden proprietary blends.
Prefer products that cite human clinical trials or peer-reviewed studies for specific doses.
Seek physician endorsement or clear guidance when combining with medications like metformin.

How to read claims vs. marketing

Marketing often uses catchy phrases like “rapid fat loss.” But, ask for proof instead. Check if the brand links to studies or meta-analyses. If a label says it's clinically proven, make sure to verify the study details before trusting it.

Match supplements to your goals

Appetite control: choose products with human data on reduced calorie intake and clear dosing instructions.
Metabolism booster: favor formulas tested for resting metabolic rate or fat oxidation in clinical trials.
Fat burning: pick thermogenic blends with safety data, specially if they contain stimulants.
Gut support: select probiotics or fiber blends shown to change microbiome markers or reduce waist circumference.

How to choose supplements for beginners

Begin with a single, well-documented product from a respected brand. Keep it simple. The safest weight loss supplements usually have modest doses and are third-party tested.

When to stop and how to monitor progress

Track your weight, waist, energy, sleep, appetite, and side effects for 4–12 weeks. If you don't see benefits after 6–12 weeks, stop. Immediately stop if you experience severe side effects like palpitations, nausea, or abnormal lab results.

Checklist Item	Why it matters	Red flags
Third-party tested supplements (USP, NSF)	Confirms purity and dose; reduces contamination risk	No seal or unverifiable testing claims
Full ingredient labels with amounts	Lets you compare to clinical trial doses and avoid hidden stimulants	Proprietary blends without amounts
Human clinical trials cited	Shows actual effect size and safety profile	“Clinically proven” with no citation
Transparent manufacturer and contact info	Enables recalls, questions, and accountability	Anonymous sellers or offshore-only contacts
Clear guidance on interactions	Protects people using medications or with conditions	No interaction warnings or medical disclaimers

Use bloodwork and basic labs to guide your choices when you can. Testing for vitamin D, thyroid function, and glucose helps tailor your approach. Following these steps reduces risk and boosts the chances of finding clinically proven weight loss supplements that meet your goals.

Conclusion

Targeted supplements can improve appetite, metabolism, gut health, and energy. Use this knowledge to choose supplements that fit your lifestyle and goals. Aim for small, steady weight loss by combining supplements with a healthy diet, exercise, and good sleep.

Begin with a simple plan. Get a blood test to understand your health baseline. Start with a probiotic and a metabolism booster or a fiber supplement to control hunger. Track your weight, waist size, energy, and mood for a few weeks.

Choose high-quality, safe supplements. Look for brands that have third-party testing and clear labels. Start with low doses and watch for any side effects. Always talk to a doctor before trying advanced supplements like NMN or NAD+ infusions.

Follow a simple checklist each month:

Review your progress against baseline tests and photos.
Change your supplement dose or type if you don't see enough benefits in 4–12 weeks.
Keep your diet, exercise, sleep, and stress management consistent.

Set realistic goals based on scientific timelines. See changes in appetite and bloating in weeks, and body composition changes in months. This approach helps keep your goals achievable and supports safe weight loss.

Below is a compact comparison to guide your first choices and follow-up steps.

Goal	Starter option	What to monitor	Timing
Appetite control	Fiber-based suppressant (psyllium, glucomannan)	Hunger, meal portions, GI tolerance	2–8 weeks
Gut-driven weight support	Clinically studied probiotic (Lactobacillus, Bifidobacterium strains)	Bloating, stool regularity, waist measurement	4–12 weeks
Metabolism boost	Safe metabolism supplement with low stimulants (green tea extract, low-dose caffeine)	Energy, sleep quality, resting heart rate	2–6 weeks
Cellular energy & long-term support	NAD+ precursors or mitochondrial support (start under clinician care)	Laboratory markers, energy, exercise recovery	8–24 weeks
Overall safety	Third-party tested brands (USP, NSF, ConsumerLab)	Label accuracy, contaminants, batch testing	Ongoing

Comparison table: quick reference for the 10 supplements (easy pros/cons and best use cases)

Here's a quick guide to the best supplements for weight loss. Leanbliss is great for those on carb-heavy diets, helping with blood sugar control. But, it might not be good if you're on metformin or insulin.

For those who snack a lot, SlimSana is a good choice. It helps control appetite but might cause mild stomach issues. Leanbiome supports gut health, helping with bloating and digestion. Yet, results can vary from person to person.

Exoburn boosts metabolism and is good for active users. It's a top choice for both men and women looking to burn fat. But, it can have stimulant effects. Mitolyn supports mitochondria, which can increase energy in older adults. It's promising but expensive and lacks long-term weight loss data.

AmylGuard blocks carbs, perfect for high-starch meals. It can lower blood sugar spikes after eating. But, it might upset your stomach. Vitalean supports metabolism daily for overall wellness. It fills nutritional gaps but might be redundant with multivitamins.

Sleeplean improves sleep, which helps with recovery and appetite control. But, it can make you feel drowsy during the day. Calmlean helps with stress eating and cortisol levels. It's good for emotional eaters, but results vary.

Lavaslim is a strong thermogenic for those looking to burn fat intensely. It's best for experienced users due to its stimulant effects. This guide helps you find the right supplement for your needs, focusing on safety and realistic results.

Frequently Asked Questions [FAQS]

What is the best fat burner for belly fat for females?

The best fat burner for belly fat for females usually combines green tea extract, capsaicin, and moderate caffeine. These ingredients support metabolism and fat oxidation. For many women, pairing a thermogenic supplement with protein intake and strength training delivers better long-term results.

What is the best fat burner for belly fat for males?

For males, effective fat burners typically include caffeine, green tea extract, and compounds like yohimbine. These support increased calorie burning and workout performance. However, results depend heavily on diet, training, and consistency.

What are the best supplements for weight loss for females over 40?

Women over 40 benefit from supplements that support metabolism, hormones, and energy. Common options include protein supplements, probiotics, green tea extract, and mitochondrial support nutrients. These help manage slower metabolism and improve overall health.

Which supplement is best for fast weight loss?

No supplement guarantees rapid weight loss safely. Thermogenic supplements and appetite suppressants may produce quicker short-term effects, but sustainable results come from combining supplements with diet, exercise, and proper sleep.

What is the most successful weight loss pill?

There is no single “most successful” pill for everyone. Clinically supported ingredients like glucomannan, green tea extract, and caffeine have consistent evidence. The best choice depends on your goals, tolerance, and health condition.

Which supplement burns the most fat?

Supplements containing caffeine, green tea extract (EGCG), and capsaicin are among the most studied for fat burning. They increase thermogenesis and fat oxidation, but their effects are moderate and work best with an active lifestyle.

What supplement can support rapid weight loss?

Appetite suppressants like glucomannan and thermogenic blends may support faster early results by reducing calorie intake and increasing energy expenditure. However, rapid weight loss should be approached cautiously for safety.

What herbs may help reduce belly fat?

Herbs such as green tea extract, capsaicin (from chili peppers), and berberine are commonly used for fat metabolism and blood sugar control. While they may support fat loss, they do not specifically target belly fat alone.

What are the best drinks for weight loss?

Water, green tea, black coffee (in moderation), and apple cider vinegar drinks are commonly used to support weight loss. These beverages may help reduce appetite, improve metabolism, and support calorie control.

What is the strongest weight loss pill over the counter?

Over-the-counter options are generally milder than prescription medications. Stronger OTC supplements often include thermogenic blends with caffeine and plant extracts. However, higher strength increases the risk of side effects, so caution is important.