28 days of creatine nitrate supplementation is apparently safe in healthy individuals.
Joy JM, Lowery RP, Falcone PH, Mosman MM, Vogel RM, Carson LR, Tai CY, Choate D, Kimber D, Ormes JA, Wilson JM, Moon JR.
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J Int Soc Sports Nutr. 2014.
PMID: 25589898
Free PMC article.