ZMA is a supplement composed of zinc monomethionine aspartate, magnesium aspartate, and vitamin B6.[1] The first study to assess the effect of supplementation with ZMA in humans was conducted by the manufacturer of this supplement and found that ZMA raised testosterone levels and increased muscle strength and power in athletes.[2] However, follow-up studies by independent groups do not support those initial findings.[3][4]
What is ZMA?
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•Last Updated: April 23, 2025
ZMA is a supplement made of zinc monomethionine aspartate, magnesium aspartate, and vitamin B6, which was initially found to raise testosterone levels and enhance muscle strength in athletes. However, subsequent independent studies have not corroborated these initial results.