Metformin-associated vitamin B12 deficiency (letter)
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Made up of three essential amino acids (cysteine, glutamate, and glycine), it is often referred to as the master detoxifier for its incredible ability to promote skin health, body function, overall mood and well-being

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Arginine: An amino acid that is a precursor to nitric oxide, which helps improve blood flow to the scalp and nutrient delivery to the hair bulb