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Besides importing from the extracellular environment, cells can synthesize serine from intracellular glucose through the de novo serine synthesis pathway (SSP), which is considered necessary for cancer cells (Locasale, 2013)

GHK-Cu is not approved by the FDA for human or veterinary use

Vitamin C is water-soluble, meaning your body uses what it needs and eliminates the rest

[1] Carnitine shuttle system [edit] The free-floating fatty acids, released from adipose tissues to the blood, bind to carrier protein molecules known as serum albumin that carry the fatty acids to the cytoplasm of target cells such as the heart, skeletal muscle, and other tissue cells, where they are used for fuel