Sarcosine gets converted into glycine in the body, so I would bet that it also provides general longevity benefits similar to glycine.
Metabolomics and lipidomics uncover the metabolic features and heterogeneity associated with sarcopenia — the age-related loss of muscle mass and strength. Circulating sarcosine levels decrease in sarcopenia and supplementation with sarcosine enhances fat metabolism and muscle repair in mice by activating anti-inflammatory macrophages. These results suggest sarcosine could be used therapeutically to slow sarcopenic progression.
Paywalled paper (Perhaps someone can upload a full paper):
https://www.nature.com/articles/s43587-025-00954-7
Source for Sarcosine:
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