Muscle & Tone

Lean mass, strength and the shape it gives you.

12 peptides · 26 linked sources

Muscle & Tone: 12 peptides and related compounds in this index have at least one researched benefit that sources link to muscle & tone. Those with approved or trial-backed evidence: HGH (Somatropin), L-carnitine, SS-31.

Peptides discussed for muscle & tone, at a glance
PeptideEvidence labelWhat sources discuss for this goal
HGH (Somatropin)Approved (specific use)Leaner body composition
BPC-157PreclinicalTendon and bone repair, mostly animal
IGF-1 LR3PreclinicalMuscle growth, no human data; Growth in catabolic rats
L-carnitineApproved (specific use)Exercise recovery
SS-31Approved (specific use)Muscle strength in Barth syndrome
SermorelinEarly humanLean mass gain, small study
5-Amino-1MQPreclinicalAged muscle regeneration, mice
MOTS-cPreclinicalExercise capacity, animal
CJC-1295 with DACEarly humanSleep, muscle and fat, unproven claims
CJC-1295 without DACPreclinicalBody composition, anecdotal
IpamorelinPreclinicalSleep and body composition, anecdotal
CJC-1295 + IpamorelinUnstudiedBody recomposition, anecdotal

Listed when one of a peptide's three researched benefits relates to muscle & tone. Strongest evidence first. Inclusion is not a recommendation, and some listed effects are unproven or failed in trials.

Approved (specific use)

Approved by the FDA (or a major regulator) for at least one specific use. Approval covers that use only, not the other benefits listed.

  1. HGH (Somatropin)

    Leaner body composition, Treats growth failure in children, Less visceral fat, better lipids

    01 Leaner body composition

    • Improves body composition: in GH-deficient adults increases lean mass (~1.4-2.6 kg) and reduces fat mass (~2.2-2.6 kg) vs placebometa-analyses of human RCTs123
    Side effects, quotes and full profile
  2. L-carnitine

    Modest weight loss, Exercise recovery, Treats carnitine deficiency

    02 Exercise recovery

    • Exercise recovery: 5-week RCT (n=80) of 2 g/day L-carnitine tartrate reduced soreness and creatine kinase and better preserved strength/power after muscle-damaging exercise; 2025 meta-analysis of 14 RCTs found reduced soreness, CK, myoglobinhuman RCTs1213
    Side effects, quotes and full profile
  3. SS-31

    Mitochondrial function, animal, Muscle strength in Barth syndrome, Exercise tolerance, animal and anecdotal

    02 Muscle strength in Barth syndrome

    • Improves knee-extensor muscle strength in Barth syndromebasis of FDA accelerated approval; confirmatory trial required1415
    Side effects, quotes and full profile

Early human

Small, short, old, unblinded or single-group human studies.

  1. Sermorelin

    Natural-rhythm GH and IGF-1, Lean mass gain, small study, Deeper sleep, anecdotal

    02 Lean mass gain, small study

    • 16 weeks of nightly GHRH(1-29) analog increased lean body mass, insulin sensitivity and skin thickness in older men (not women)small human placebo-controlled study1617
    Side effects, quotes and full profile
  2. CJC-1295 with DAC

    Days-long GH and IGF-1 rise, Visceral fat, trial halted, Sleep, muscle and fat, unproven claims

    03 Sleep, muscle and fat, unproven claims

    • Claimed sleep, muscle and abdominal fat-loss benefits are extrapolated from GH/IGF-1 elevation and GHRH research; no dedicated CJC-1295 outcome studiespractitioner/vendor review22
    Side effects, quotes and full profile

Preclinical

Mostly cell and animal studies. Human effects unknown.

  1. BPC-157

    Tendon and bone repair, mostly animal, Knee pain relief, small uncontrolled study, Gut lining protection, unproven

    01 Tendon and bone repair, mostly animal

    • Musculoskeletal healing (tendon, ligament, muscle, bone): improved functional, structural and biomechanical outcomes in animal injury models; human data limited to tiny pilot studiesmostly animal456
    Side effects, quotes and full profile
  2. IGF-1 LR3

    Muscle growth, no human data, Growth in catabolic rats, Native IGF-1 is an approved drug

    01 Muscle growth, no human data

    • Muscle growth/'pumps' are the main use, but there is no human muscle-growth evidence; users report fullness/pumps and sometimes better recovery, lasting gains inconsistentanecdotal/Reddit789

    02 Growth in catabolic rats

    • Growth restoration in diabetic/catabolic rats without all insulin-like effects (animal), but reduced growth and feed intake in pigsanimal, inconsistent1011
    Side effects, quotes and full profile
  3. 5-Amino-1MQ

    Fat loss, mice, Aged muscle regeneration, mice, Metabolic health, mice

    02 Aged muscle regeneration, mice

    • Aged muscle regeneration: in 24-month-old mice, activated senescent muscle stem cells, roughly doubled regenerating fiber size and increased peak torque ~70% after injuryanimal1819
    Side effects, quotes and full profile
  4. MOTS-c

    Insulin sensitivity, animal, Exercise capacity, animal, Endurance, anecdotal

    02 Exercise capacity, animal

    • Improves exercise capacity/endurance: old mice treated with MOTS-c ran ~2x longer and farther; late-life treatment improved grip strength and gaitanimal study2021
    Side effects, quotes and full profile
  5. CJC-1295 without DAC

    Natural-pattern GH pulses, theoretical, Deeper sleep, anecdotal, Body composition, anecdotal

    03 Body composition, anecdotal

    • Body composition/recovery changes reported by users after ~8-12 weeks, usually stacked with ipamorelinanecdotal/Reddit23
    Side effects, quotes and full profile
  6. Ipamorelin

    Selective GH release, animal, Gut motility, negative trial, Sleep and body composition, anecdotal

    03 Sleep and body composition, anecdotal

    • Sleep quality and body composition: users frequently report deeper sleep and, after 8-12 weeks, recompositionanecdotal/Reddit2425
    Side effects, quotes and full profile

Unstudied

No direct studies of this product or blend. Anecdote and component data only.

  1. CJC-1295 + Ipamorelin

    Amplified GH pulses, theoretical, Better sleep, anecdotal, Body recomposition, anecdotal

    03 Body recomposition, anecdotal

    • Body composition/recovery changes reported around 8-12 weeks, sometimes with lab IGF-1 data posted by usersanecdotal2326
    Side effects, quotes and full profile

Questions about muscle & tone

Which peptides are discussed for muscle & tone?

HGH (Somatropin), BPC-157, IGF-1 LR3, L-carnitine, SS-31, Sermorelin, 5-Amino-1MQ, MOTS-c, CJC-1295 with DAC, CJC-1295 without DAC, Ipamorelin, CJC-1295 + Ipamorelin.

Which have the strongest evidence for muscle & tone?

Labelled approved or trial-backed: HGH (Somatropin), L-carnitine, SS-31. Approval covers specific uses only.

Is any of this a recommendation?

No. humanpeptides.fyi makes no claims of its own. Each entry reports what cited sources say, with links. Talk to a licensed clinician.

Before you go in

humanpeptides.fyi is an educational index for adults. It summarizes and links to what others have published and reported about peptides and related compounds studied or used in humans. It is not medical advice and gives no dosing guidance. Many listed compounds are not approved for human use, and listing one is not a recommendation. Anecdotes are unverified. Images are AI-generated. By continuing, you agree to the Disclaimer and Terms of Use and the Privacy Notice.

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