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Most supplements have an expiration or "use by" date about two years after production

There are five known melanocortin receptors, and MT-2 primarily binds with MC-4R and MC-1R, which are involved in feeding, sexual behavior, and skin pigmentation

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Funding This work was supported by the Natural Science Foundation Council of China (81922081and 81700780)

If you are breastfeeding, consult your healthcare provider prior to treatment

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