Perhaps a question all consumers on this side of Earth tend to ask is, "Sure this thing works ah?" or "REAL or not?" in typical Asian flavour combo-ed with an equally skeptical mentality. Especially so if the 'wants' are seemingly a little out of their league - like losing 20 pounds or conversely, gaining 20 pounds. Well, here's one for the haters and non-believers...
Supplements ain't hocus pocus mumbo jumbo concocted in some stonehenge by druids or in Baba Yaga's apothecary o' voodoo mystics obscura. Maybe those 'ubat kuat lelaki' stuff usually advertised on lamp posts or whatever is, but certainly not cutting edge supplements borne from the scientific method.
I should know, having spent my tertiary education on the subject matter of science. Now its not so much about the level of education here... even a lawyer, engineer or architect who've spent thousands in the pursuit of knowledge may not be the wiser. Simply because theirs is a different stream of knowledge. I'll cut to the chase.
Behold. The metabolic pathway chart. This bitch of a chart shows various processes that occurs in the human body. Like how sugars are stored in the liver as glycogen, etc. I remember wrestling with this chart in the examination halls as though I was looking for Aztec ruins during my Cell Metabolism paper. This bible of physiological processes was put together by scientists after the deaths of many rats/mice I'm sure of it. Oh yeah, the one on the left is truncated. The real deal is about 4-5 times the size of that.
Anyway, supplements affect you by targeting certain processes in your body whether it's providing more of a substrate (material used) or by shutting off pathways. For example, understanding muscle activity. Just look at the chart you can see familiar stuff like glutamine, alanine, glucose, etc.
So there you have it. The power of science at work.