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Description
At position fifteen, the amino acid histidine (His) is replaced with a modified amino acid called D-Phenylalanine (D-Phe)

Jalil, Luigi Gabrielli, Mara Paz Ocaranza, Paul MacNab, Rodrigo Fernndez, Bruno Grassi, Paulina Jofr, Hugo Verdejo, Monica Acevedo, Samuel Cordova, Luis Sanhueza, Douglas Greig International Journal of Molecular Sciences.2024

Holas products are intended solely for research, laboratory, or analytical purposes and arenot authorized, approved, or permitted for use in or on humans or animals

In fact, MOTS-c levels naturally rise during exercise, and giving MOTS-c to mice has been shown to enhance their physical performance (they can run longer on a treadmill)
