Testosterone is the key hormone necessary for men to build quality shapely muscles. Do you want to know what sports supplements will skyrocket your testosterone levels? Then read on...

So, what are the safe, legal and effective ways that we men have to boost our natural testosterone levels?

I want to take a look now at 8 popular testosterone enhancing sports supplements. You may or may not have heard about all 8, but do you know if they actually work? This article will answer that question for you.

Here are the 8 testosterone boosters we will be looking at:

1. ZMA 2. Tribulus Terrestris 3. Fenugreek 4. Activate by Designer Supplements 5. 6-OXO 6. Avena Sativa 7. Tongkat Ali 8. Yohimbe

ZMA – ZMA is a designed mineral formula comprised of zinc monomethionine aspartate, magnesium aspartate and vitamin B-6. They are combined in specific ratios to supposedly maximize the effectiveness of ZMA. A 1999 study showed increases of up to 30% in free and total testosterone during an 8 week study of NCAA football players. However, this study was conducted by one of the owners of the company that holds the patent on ZMA. Not completely unbiased.

ZMA may have helped testosterone levels because the mineral zinc and magnesium play important roles in the production of anabolic hormones, especially testosterone. The study participants were shown to have borderline deficient levels of both minerals at the beginning of the study, so raising their levels to normal could have accounted for the rise in testosterone.

I wouldn't rule out ZMA completely, most people in the U.S. are deficient in both zinc and magnesium. If you are slghtly deficient in zinc and/or magnesium ZMA could increase your testosterone production by bringing your levels back to normal. 8 out of 10 stars!

Tribulus Terrestris – This is a weed that grows in temperature and tropical climates and has been used for centuries to increase libido in males. Does it also increase testosterone levels as many supplement companies would have you believe? That depends on who is taking it.

Tribulus terrestris HAS been shown to increase testosterone levels by as much as 30%, but only in individuals who have low testosterone levels to begin with. It will raise your levels to normal, but it will not raise them if you already have normal testosterone levels.

So, tribulus terrestris is partially useful as a testosterone booster. If you are overtrained, if you are on a low calorie ‘cutting' diet or if you are recovering from steroid or prohormone use (as part of PCT) tribulus terrestris can be useful n raising your testosterone levels. Don't expect that it will give you super high test levels or significantly increased libido. 6 out of 10 stars!

Fenugreek – Fenugreek is an herb found primarily in Indian food. It has historically been used by nursing mothers to increase milk production. Studies on fenugreek are scant, but it has been shown to decrease blood sugar levels of type II diabetics.

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