Axis-HT is a testosterone booster supplement made by BSN. BSN is well known for their high quality products, and they also make quite a few other very popular bodybuilding supplements such as NO-xplode, Cell Mass, and True Mass. BSN calls their Axis-HT the "Multi-dimensional natural testosterone amplifying formula". As most people probably known, testosterone is a male sex hormone that affects muscle growth and supports normal male development such as facial hair and a deeper voice. Testosterone is used to treat males with low levels of testosterone.
However, in bodybuilding, for serious athletes and average Joes looking for natural ways to increase testosterone, boosters such as Axis-HT are used. Note though, Axis HT is NOT a hormone - as in, that it is not testosterone itself. Instead, it is a combination of several different ingredients that helps the body maximize its own testosterone production. Because of this, I generally believe that it's a bit of a waste of money for young guys (in their late teens or early to mid 20's) to be using any type of these natural testosterone boosters. Simply because during those years, you body is cranking out testosterone anyways, and you're not likely to see much benefit from using a natural test booster like Axis-HT. This is part of the reason why you see such divergent user reviews posted on various testosterone booster supplements.
Typically, older males will notice much more effects from using something like Axis-HT compared to younger males. That's just the way it is. So if you're still quite young, save yourself the money, and spend it on some whey instead.
BSN Axis HT Side Effects & Review
So, let's get a quick rundown on the key ingredients of Axis-HT. It contains some ZMA, tribulus terrestris, safed musli, eurycoma longifolia, and coleus forskohlii. ZMA, as we all know, is zinc and magnesium aspartate, and these are depleted during stress and exercise, leading to reduced testosterone levels. So supplementing ZMA helps alleviate this effect.
Tribulus terrestris is another somewhat controversial bodybuilding supplement with very contradicting study results and opinions. It has been widely promoted and used as a natural testosterone booster and aphrodisiac, and it is widely used in most of the different natural test booster supplements on the market. However, there are various studies that have found little to no benefit of using tribulus terrestris for enhancing testosterone levels. Then on the other hand, there are plenty of user reports and anecdotal evidence that support the use of tribulus terrestris.
Eurycoma longifolia is also known as Tongkat Ali, and this is another herb that works in similar way as tribulus. It stimulate lutenizing hormone which in turn helps signal increased testosterone production. Coleus Forskohlii is another key ingredient in Axis HT that's been found to help decrease body fat, improve body composition, increase lean body mass, and increase free testosterone levels. 
There's really little to no side effects of Axis HT. Some users have reported increased aggression, acne breakouts, and greatly increased libido. My personal experiences with Axis HT did not include any side effects. My workouts were more intense, and the strength gains were noticeable. I did also experience a massive boost in libido, which is quite common with most testosterone booster supplements. Again, as said earlier, if you're a young guy, save your money and spend it on something else. But if you're 30+, and looking for a natural supplement to increase your test levels, then give Axis HT a shot. You won't be disappointed.
1. Obes Res. 2005 Aug;13(8):1335-43.
Body composition and hormonal adaptations associated with forskolin consumption in overweight and obese men.
Godard MP, Johnson BA, Richmond SR.
University of Kansas, Department of Health, Sport and Exercise