What are the side effects of MOTS-c?
The most commonly reported MOTS-c side effects are mild fatigue early, injection-site soreness. Most are mild and tend to be dose dependent. It is generally avoided with active malignancy. Human clinical evidence for MOTS-c is limited, so this reflects reported and observed effects, not a complete safety profile.
Reported MOTS-c side effects
- Mild fatigue early
- Injection-site soreness
Who should avoid it
- Active malignancy
- Pregnancy / nursing
Bloodwork worth tracking
- Fasting glucose / insulin baseline + week 6
References
- MOTS-c: a mitochondrial-derived peptide regulating holistic metabolism — Lee C et al., Trends Endocrinol Metab, 2020
- MOTS-c is an exercise-induced mitochondrial-encoded regulator of age-dependent physical decline and muscle homeostasis — Reynolds JC, Lai RW, Woodhead JST, et al. (Lee C, senior author) — Nature Communications, 2021
- Mitochondrial-Encoded Peptide MOTS-c, Diabetes, and Aging-Related Diseases — Kong BS, Lee C, Cho YM — Diabetes & Metabolism Journal, 2023
Pepdex is an editorial reference, not medical advice. Peptides vary in legal and approval status by country, many are research compounds without full human safety data. Talk to a qualified clinician before starting anything.
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Last updated 2026-06-06.