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For example, a 2023 study in Human Nutrition & Metabolism found that a 24 hour fast did not decrease serum creatine levels in healthy adults, although it did change levels of its precursor and breakdown products, showing the body may adjust how it handles creatine during fasting

doi: 10.1089/ars.2017.7216 25

Peptides occur naturally in the body, but their levels decline with age

Ishibashi K, Ishii K, Sugiyama G, Sumida T, Sugiura T, Kamata Y, Seki K, Fujinaga T, Kumamaru W, Kobayashi Y (2018) Deregulation of nicotinamide N-methyltransferase and gap junction protein alpha-1 causes metastasis in adenoid cystic carcinoma

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