ZMA is a scientifically designed anabolic mineral formula containing zinc monomethionine aspartate, magnesium aspartate and vitamin B-6. Studies have shown that it has a clinical effect on testosterone levels when taken in a combination containing 30 mg of zinc and 450 mg of magnesium per day. The most famous study conducted by Lorrie Brilla at Western Washington University indicated that this combination could raise testosterone levels by as much as 30%.

Bodybuilders can obviously benefit from taking ZMA, specifically in the following ways:

1. It increases the body's natural production of testosterone thus boosting its capacity for building lean muscle.

2. It increases levels of growth hormone.

3. It helps sleep if taken 30-60 minutes before bed thus enhancing rest and recovery.

ZMA has no known side effects but it must be taken in the proper dosage to the exact proportions used in most studies - that is 11 mg of vitamin B-6, 450 mg of magnesium and 30 mg of zinc.

Richard Mitchell is the creator of the bodybuildingadvisor.com website that provides guidance and information to athletes at all levels of bodybuilding experience. Go to Bodybuilding Advice to learn more about the issues covered in this article.