best foods to eat to gain muscle We scoured the database of the National Center for Biotechnology Information (part of the U.S. National Library of Science) for articles. Of the many ingredients marketed as boosting testosterone levels, we only found four backed by multiple articles based on human testing. For the best chance of boosting testosterone levels, a supplement needs to contain magnesium, fenugreek, and longjack — and some zinc wouldn’t go astray, either.We required magnesium: a key ingredient for muscle building.Magnesium is an essential mineral all on its own. It supports your immune system and helps “maintain normal nerve and muscle function” and everyone should (boosting aside) make sure they’re getting enough of it. It’s commonly found in food, meaning it’s pretty difficult to develop a magnesium deficiency. http://www.cureidea.com/maxx-power-testosterone-review/