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Best Supplements for Muscle Growth and Strength in 2026: What the Evidence Supports

Muscle growth supplements ranked by evidence, from creatine monohydrate and whey or plant protein to HMB, essential amino acids, vitamin D and citrulline, with in-stock picks for each need.

Published

November 6, 2026

Read time

13 min read

Medically reviewed by

Rhonda Collins, FNP-C

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Quick Summary

The best supplements for muscle growth are creatine monohydrate and protein, in that order. Creatine taken alongside resistance training added about 1.1 kg of lean mass over training alone in a meta-analysis of randomized trials ^[1]. Protein supplements added strength and lean mass, with no further lean mass gain once total protein intake passed about 1.6 g per kg of body weight a day ^[2]. HMB and essential amino acids have weaker or conditional evidence, vitamin D matters mainly if you are low, and citrulline’s effect is small. Training and total protein drive most of the gains, and no supplement replaces them.

Introduction

“Which supplements actually help me build muscle?”

The problem: muscle-building supplements are sold with bigger promises than almost any other category. Store shelves mix well-studied ingredients like creatine with proprietary “anabolic” blends, and independent testing has found products labeled as ordinary supplements that contained undeclared steroid hormones ^[3].

Why it matters: muscle and strength are worth building at every age, not only for athletes. In adults averaging about 64 years old, the gains from resistance training showed up in everyday tasks such as rising from a chair ^[4]. The supplements that help do so on top of a training program and enough protein, so it pays to put money where the evidence is.

How this guide picks:

• Evidence first: each ingredient is graded by what systematic reviews and meta-analyses of randomized trials found, not by label claims.
• Grouped by need: strength and lean mass, protein intake, older adults, vitamin D status and training performance each have a different best option.
• Catalog products only: every pick is a named product in Mito’s supplement catalog that was in stock when this guide was written.
• Mixed brands: no brand has more than two picks.

What this guide leaves out: testosterone boosters, prohormones, SARMs and anabolic steroids, because they are either unsupported by trials or not legal supplements. Our guide to testosterone boosters covers what those products contain. It also leaves out beta-alanine, which was not in stock in our catalog when this guide was written, and ashwagandha, covered in ashwagandha for muscle growth.

Which supplement for muscle growth fits your goal?

The table maps each common goal to the ingredient with the best evidence, and says plainly how strong that evidence is.

Top picks

Reviews

Best for Strength and Lean Mass: Creatine Monohydrate

Creatine is the best-studied supplement for muscle. It raises the creatine stored in muscle, which helps you do more work in short, hard efforts and so get more out of training ^[10]. In a meta-analysis of 35 randomized trials with 1,192 participants, creatine combined with resistance training increased lean mass by about 1.1 kg more than training alone, regardless of age. Creatine without exercise made no significant difference, and the gain was larger and significant in men than in women ^[1]. In adults averaging about 64 years old, creatine added to about 12 weeks of resistance training increased lean mass and chest-press and leg-press strength more than training alone ^[4]. The International Society of Sports Nutrition (ISSN) calls creatine monohydrate the most extensively studied and clinically effective form ^[10]. All three picks are plain monohydrate with nothing added. For more background, see our guide to creatine.

Best for single-serving packets, NSF Certified for Sport

1. Thorne Creatine

• Form: Unflavored powder in single-serving packets
• Key Ingredient: Creatine monohydrate, 5 g per packet
• Label Serving: 1 packet
• Servings per Container: 30
• Third-Party Testing: NSF Certified for Sport
• Best For: single-serving packets, NSF Certified for Sport

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Review with a clinician before buying

Creatine is partly broken down into creatinine, the marker a standard kidney blood test reads. If you have kidney disease, review creatine with your doctor before starting, and tell whoever reads your labs that you take it.

Creatine is an amino acid found mostly in your muscles and in the brain.

Pros

• Creatine monohydrate, the form used in most trials
• NSF Certified for Sport, tested for label accuracy and banned substances
• Packets make it easy to carry

Cons

• Costs more per serving than a tub

Best for the lowest-priced creatine in this guide

2. Momentous Creatine

• Form: Unflavored micronized powder
• Key Ingredient: Creatine monohydrate, 5 g per scoop
• Label Serving: 1 scoop (5 g)
• Container Sizes: 150 g or 450 g
• Best For: the lowest-priced creatine in this guide

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Creatine replenishes ATP, your body's primary energy currency, to support strength, power, recovery, lean muscle growth, and cognitive performance.

Pros

• Creatine monohydrate with no other ingredients
• Two tub sizes
• Lowest list price among the picks

Cons

• The product page describes independent testing but names no certification seal

Best for a larger tub of plain creatine monohydrate

3. Klean Athlete Klean Creatine

• Form: Unflavored powder
• Key Ingredient: Creatine monohydrate, 5 g per scoop
• Label Serving: 1 scoop
• Container Size: 315 g
• Best For: a larger tub of plain creatine monohydrate

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If your sport requires you to go 'all out' for short bursts, creatine can help you reach your strength and power objectives.

Pros

• Creatine monohydrate with no other ingredients
• Gluten-free, vegan and non-GMO
• More servings per tub than the smaller Momentous size

Cons

• No third-party certification stated on the product page

Best for Reaching Your Protein Target: Whey and Plant Protein

Protein powder is food in a convenient form. In a meta-analysis of 49 randomized trials with 1,863 healthy adults, protein supplements during resistance training increased gains in one-repetition maximum strength and lean mass, though the added lean mass averaged about 0.3 kg. The benefit was smaller with older age and leveled off once total protein intake, from food and supplements, reached about 1.6 g per kg of body weight a day ^[2]. The ISSN protein position stand describes 1.4 to 2.0 g per kg a day as sufficient for most people who exercise, and notes that whole food can meet that target, with supplements as a practical option ^[7]. So a powder earns its place when your diet falls short, not as an extra on top of a diet that already gets there. The same position stand notes that rapidly digested proteins rich in essential amino acids and leucine, such as whey, are the most effective at stimulating muscle building ^[7]. A plant blend that provides all the essential amino acids suits people who avoid dairy.

Best for an unflavored whey isolate with 24 g of protein per scoop

1. NOW Sports Whey Protein Isolate Pure

• Form: Unflavored powder
• Protein: 24 g per scoop, from microfiltered whey protein isolate
• Label Serving: 1 scoop (28 g)
• Container Size: 544 g
• Best For: an unflavored whey isolate with 24 g of protein per scoop

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NOW® Whey Protein Isolate is a high quality protein that is both bioavailable and easily digested.

Pros

• Short ingredient list with no sweeteners or flavors
• Unflavored, so it mixes into food and drinks
• Isolate is lower in lactose than concentrate

Cons

• Contains milk and soy lecithin
• Smaller tub than the Metagenics whey

Best for a flavored whey isolate and hydrolyzed whey blend

2. Metagenics Perfect Protein Whey

• Form: Vanilla powder
• Protein: 20 g per serving, from whey isolate and hydrolyzed whey
• Label Serving: 2 scoops (27 g)
• Container Size: 810 g
• Best For: a flavored whey isolate and hydrolyzed whey blend

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Protein is a crucial macronutrient needed to support overall health.

Pros

• Full amino acid profile listed on the label
• Flavored with a small amount of cane sugar and stevia
• Larger tub than the NOW isolate

Cons

• Highest list price in this guide
• Less protein per serving than the NOW isolate

Best for a dairy-free, plant-based protein

3. Garden of Life Raw Organic Protein

• Form: Vanilla spiced chai powder
• Protein: 22 g per scoop, from a blend of sprouted plant proteins
• Label Serving: 1 scoop
• Container Size: 580 g
• Best For: a dairy-free, plant-based protein

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Raw Organic Protein is a Certified Organic, Non-GMO Project Verified raw vegan protein powder made with 13 raw sprouted proteins delivering 22 grams of protein that is dairy free with a complete profile of all the essential amino acids along with added whole food fat-soluble vitamins, probiotics and enzymes.

Pros

• Dairy-free and vegan, with all essential amino acids
• Certified organic and Non-GMO Project Verified

Cons

• Adds vitamins, probiotics and enzymes you may not need
• Made in a facility that also processes milk, soy, egg and tree nuts

Best for Older Adults and Low Protein Intake: HMB and Essential Amino Acids

HMB is a breakdown product of leucine, one of the essential amino acids. Its evidence depends on who takes it. In a meta-analysis of seven trials in 287 adults aged 65 and older, HMB was linked to a small gain in muscle mass compared with control groups, with no change in fat mass ^[5]. In younger adults who lifted weights, a meta-analysis of 11 trials found no significant effect on lean mass or strength ^[6]. Essential amino acids are what make complete protein able to build muscle ^[7], which is why an amino acid powder makes most sense for someone who struggles to eat enough protein, such as an older adult with a small appetite. If you already reach your protein target, extra amino acids and HMB are unlikely to add much.

Best for HMB on its own, with vitamin D3

1. XYMOGEN Athletix HMB Pro

• Form: Capsule
• Key Ingredients: Calcium HMB monohydrate 3 g and vitamin D3 12.5 mcg (500 IU) per serving
• Label Serving: 6 capsules
• Servings per Container: 25
• Best For: HMB on its own, with vitamin D3

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HMB PRO features beta-hydroxy-beta-methylbutyrate (HMB), a natural metabolite of leucine that supports increased protein synthesis and decreased protein degradation.

Pros

• Every ingredient amount is disclosed
• Formulated without common allergens

Cons

• Six capsules per serving
• No significant benefit for lean mass or strength in younger trained adults

Best for a leucine-rich amino acid powder with HMB

2. Klean Athlete Klean Essential Aminos +HMB

• Form: Flavored powder
• Key Ingredients: Essential amino acid blend 3.35 g with 1,271 mg leucine, HMB 1.5 g, glutamine 2 g and vitamin D3 12.5 mcg (500 IU) per scoop
• Label Serving: 1 scoop
• Container Size: 275 g
• Best For: a leucine-rich amino acid powder with HMB

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No matter if you’re in your 30’s or 70’s, Klean Essential Aminos + HMB is designed with a leucine-rich blend of essential amino acids combined with HMB®, vitamin D3 and glutamine to support building lean muscle mass and function for all adult athletes.

Pros

• Every ingredient amount is disclosed
• Leucine makes up over a third of the amino acid blend

Cons

• Supplies far less protein per serving than a protein powder
• Contains phenylalanine, so not suitable with phenylketonuria

Best for Low Vitamin D: Vitamin D3 with K2

Vitamin D is not a muscle builder, but low levels are common and matter for muscle function. In a meta-analysis of 30 randomized trials with 5,615 people, vitamin D supplements had a small positive effect on muscle strength and no significant effect on muscle mass or power. The strength effect was larger in people whose 25-hydroxyvitamin D level was below 30 nmol/L and in adults aged 65 and older ^[8]. That makes a blood test the sensible first step: it tells you whether there is anything to correct.

Best for correcting a low vitamin D level

1. Carlson Labs Adult D3 & K2

• Form: Vegetable capsule
• Key Ingredients: Vitamin D3 2,000 IU (50 mcg) and vitamin K2 as MK-7 90 mcg per serving
• Label Serving: 2 capsules
• Servings per Container: 60
• Best For: correcting a low vitamin D level

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Vitamin D3 and K2 as MK-7 work synergistically to support cardiovascular system and bone health.

Pros

• Vitamin D3, the form most supplements use
• Two nutrients in one product

Cons

• Vitamin K can interfere with warfarin, as the label warns
• Two-capsule serving

Best for Training Performance (Optional): L-Citrulline

Citrulline is an amino acid that the body converts to arginine, and it is common in pre-workout products. A meta-analysis of 12 placebo-controlled studies with 198 participants found a small benefit for strength and power performance, but each individual study’s confidence interval crossed zero, and the authors suggested it may matter most for high-level athletes, where small margins count ^[9]. The analysis included only studies that gave at least 3 g of citrulline 30 minutes or more before exercise. It is optional: try it only once training, protein and creatine are in place.

Best for plain citrulline with no added stimulants

1. NOW Foods L-Citrulline Powder

• Form: Unflavored powder
• Key Ingredient: L-citrulline, 1.5 g per half teaspoon
• Label Serving: 1/2 level teaspoon (about 1.5 g)
• Container Size: 113 g
• Best For: plain citrulline with no added stimulants

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Review with a clinician before buying

The label advises checking with a physician first if you take blood pressure medicines, nitrates or other vasodilating drugs, or have abnormal blood pressure.

Citrulline is a non-essential amino acid that is an important intermediate in the urea cycle, functioning along with other amino acids to rid the body of ammonia, a byproduct of protein metabolism.

Pros

• Citrulline only, with no caffeine or other stimulants
• Free of wheat, gluten, soy and milk ingredients

Cons

• The label serving is below the 3 g the studies used
• Small, inconsistent effect in trials

What to look for in a muscle growth supplement

1. Creatine Monohydrate, Not a Blend

Creatine monohydrate is the most extensively studied form ^[10]. Many products add collagen, electrolytes, caffeine or branched-chain amino acids, which raises the price without adding evidence. Check that the label lists creatine monohydrate and the amount per serving.

2. Protein Per Serving and Per Dollar

For protein powder, compare grams of protein per serving and what each serving costs, not scoop size. Whey isolate is lower in lactose than whey concentrate, and plant blends should supply all the essential amino acids.

3. Third-Party Testing for Banned Substances

An international study of 634 supplements found that about 15% contained anabolic steroids not listed on the label ^[3]. If you compete in a tested sport, look for NSF Certified for Sport or a similar seal, which screens for banned substances. For what each seal covers, see how to choose a supplement brand.

4. Stated Amounts, Not Proprietary Blends

A label that lists each ingredient and its amount lets you match it to the trials. A proprietary blend that gives only a total weight hides whether you are getting a meaningful dose of anything.

5. Hidden Stimulants

Pre-workout and “muscle builder” products often contain caffeine or other stimulants, sometimes in large amounts. Read the full label if you are sensitive to caffeine, train in the evening or take medicines that affect heart rate or blood pressure.

6. Claims That Overreach

Be wary of labels promising “anabolic” effects, testosterone boosts or results “in days.” Even creatine, the best-studied option, was tested over weeks to months of training ^[1].

Cost Comparison

Current prices show on each product card above, in the “From” line, and come live from Mito’s catalog. The price band below compares each product’s lowest list price in the catalog on November 6, 2026 with the other picks in this guide, from budget through mid to premium.

Best value: Momentous and Klean Athlete creatine are the lowest-priced ways to take the best-supported supplement in this guide.

Most protein per serving: the NOW Sports whey isolate gives 24 g of protein per scoop with no added flavors or sweeteners.

Test This with Mito

Supplements are easier to judge when you can measure what they are meant to change. Mito offers tests that show whether muscle is actually being gained and whether anything is holding it back, with physician-guided interpretation:

• DEXA Body Composition Scan: measures body fat, lean mass and visceral fat, region by region. A scale cannot tell muscle from fat, so a baseline scan and a repeat after a few months of training are the clearest way to see whether creatine, protein and your program are working. Our guide to protecting muscle on GLP-1 medicines shows how the scan is used to track lean mass.
• Mito Core Panel: 100+ biomarkers including vitamin D, testosterone and the kidney markers creatinine and eGFR. Vitamin D tells you whether a supplement has anything to correct ^[8]. A baseline before you start creatine helps, because creatine is partly broken down into creatinine, so your result is easier to read against a number taken before you started ^[10].

How to decide:

• Starting a training program and want a baseline: the DEXA Body Composition Scan, repeated after a few months.
• Thinking about vitamin D, or about to start creatine: the Mito Core Panel.
• Training hard but recovering poorly: the Mito Core Panel. See poor workout recovery and the blood tests that explain it.

Key Takeaways

• Training and total protein drive most of the gains: supplements add to a resistance training program, not replace it ^[1][2].
• Creatine monohydrate has the strongest evidence, adding about 1.1 kg of lean mass with resistance training in a meta-analysis ^[1].
• Protein powder helps when your diet falls short, with little extra lean mass above about 1.6 g of protein per kg a day ^[2].
• HMB and amino acids are conditional: a small benefit in older adults, none in younger trained adults ^[5][6].
• Vitamin D and citrulline are minor: vitamin D matters most if you are low ^[8], and citrulline’s effect is small ^[9].
• Third-party testing matters, because independent testing has found undeclared steroids in ordinary supplements ^[3].

Related Content

• Creatine: The Overlooked Supplement
• Creatine Kinase Blood Test
• GLP-1 Muscle Loss and DEXA Scans
• What Your Hand Grip Strength Tells You About Your Health
• Magnesium for Sleep and Strength: Which Type to Pick
• Best Magnesium Supplements: Brands Ranked by Quality

Medical Disclaimer

This article is for educational and informational purposes only and does not constitute medical advice. The information provided should not be used for diagnosing or treating a health condition. Always consult with your doctor or qualified healthcare provider before starting any new supplement, making changes to your diet, or if you have questions about a medical condition.

References

1. Delpino FM, Figueiredo LM, Forbes SC, et al. Influence of age, sex, and type of exercise on the efficacy of creatine supplementation on lean body mass: a systematic review and meta-analysis of randomized clinical trials. Nutrition. 2022;103-104:111791. PMID: 35986981

2. Morton RW, Murphy KT, McKellar SR, et al. A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults. Br J Sports Med. 2018;52(6):376-384. PMID: 28698222

3. Geyer H, Parr MK, Mareck U, et al. Analysis of non-hormonal nutritional supplements for anabolic-androgenic steroids: results of an international study. Int J Sports Med. 2004;25(2):124-129. PMID: 14986195

4. Devries MC, Phillips SM. Creatine supplementation during resistance training in older adults: a meta-analysis. Med Sci Sports Exerc. 2014;46(6):1194-1203. PMID: 24576864

5. Wu H, Xia Y, Jiang J, et al. Effect of beta-hydroxy-beta-methylbutyrate supplementation on muscle loss in older adults: a systematic review and meta-analysis. Arch Gerontol Geriatr. 2015;61(2):168-175. PMID: 26169182

6. Jakubowski JS, Nunes EA, Teixeira FJ, et al. Supplementation with the leucine metabolite β-hydroxy-β-methylbutyrate (HMB) does not improve resistance exercise-induced changes in body composition or strength in young subjects: a systematic review and meta-analysis. Nutrients. 2020;12(5):1523. PMID: 32456217

7. Jäger R, Kerksick CM, Campbell BI, et al. International Society of Sports Nutrition position stand: protein and exercise. J Int Soc Sports Nutr. 2017;14:20. PMID: 28642676

8. Beaudart C, Buckinx F, Rabenda V, et al. The effects of vitamin D on skeletal muscle strength, muscle mass, and muscle power: a systematic review and meta-analysis of randomized controlled trials. J Clin Endocrinol Metab. 2014;99(11):4336-4345. PMID: 25033068

9. Trexler ET, Persky AM, Ryan ED, et al. Acute effects of citrulline supplementation on high-intensity strength and power performance: a systematic review and meta-analysis. Sports Med. 2019;49(5):707-718. PMID: 30895562

10. Kreider RB, Kalman DS, Antonio J, et al. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. J Int Soc Sports Nutr. 2017;14:18. PMID: 28615996

Frequently asked questions

What is the most effective supplement for muscle growth?

Creatine monohydrate has the strongest evidence. In a meta-analysis of 35 randomized trials, creatine taken alongside resistance training added about 1.1 kg of lean mass compared with training alone. Protein supplements come second, and mainly help when your diet falls short of your protein needs. Both work with training, not instead of it.

Do I need protein powder to build muscle?

No. Protein powder is a convenient way to reach your daily protein target, not a requirement. A meta-analysis of 49 trials found that protein supplements added to strength and muscle gains from resistance training, but the extra gain in lean mass leveled off at a total protein intake of about 1.6 g per kg of body weight a day, from food and supplements combined. If your diet already reaches that, a powder adds little.

What are the best supplements for muscle recovery?

Recovery between sessions depends mostly on sleep, total protein and how hard you train. Getting enough protein, from food or a powder, has the clearest support for rebuilding muscle after training. Creatine helps you handle more training volume over time. Products sold as recovery blends often add amino acids, HMB or citrulline, which have weaker or mixed evidence.

Is creatine safe for your kidneys?

In healthy people, the International Society of Sports Nutrition reviewed studies of creatine at up to 30 g a day for 5 years and judged it safe and well tolerated. Creatine is partly broken down into creatinine, the waste product a standard kidney blood test measures, so tell whoever reads your labs that you take it. If you already have kidney disease, discuss creatine with your doctor before starting.

Do muscle growth supplements work without lifting weights?

Mostly not. In the creatine meta-analysis, creatine with resistance training added lean mass, while creatine without exercise made no significant difference. Protein supplement trials measured gains during resistance training programs too. Training is what creates the signal to build muscle, and supplements add to it at the margin.