I've heard a lot about supplements made for body building that decrease estrogen production and increase testosterone production. I'm not sure if I can mention the name..starts with an N and rhymes with rolodex, if that rings a bell to anyone. Anyway, does anyone know if these work, at all? More importantly, are they safe?

As usual.. Wikipedia has the answer:

There are several naturally occurring plants and vitamins as well as synthetic chemicals that supplement companies claim may produce an increase in testosterone levels. However, the validity of many of these products is questionable due to a lack of valid scientific research showing their effectiveness, and even scientific evidence showing a lack of effectiveness.

Excess testosterone can cause undesirable side effects, such as hair loss and acne, and may be converted into estrogens.

I didn't see the actual supplement you're referring to, without it's name I can't beat google with it untill it coughs up some actual scientific research. I'd suggest googling the name with the word "risks" or "side effects" or something to that effect and see what sites that DO NOT SELL the stuff say.
If all you read are sites that sell the stuff, then all you see is a sales pitch which is almost certain to skew the truth for better sales.

I have some vitamins from GNC called Zinc Magnesium Aspartate (ZMA). I got it because after alot of research this vitamin is supposed to naturally raise your T levels with little to no side-effects. I've been taking it for months now and haven't had any side-effects. It's main purpose is metabolic support which helps weight loss. I have no idea if my natural T levels have increased (haven't had blood test) but I know it does make you lose weight. I'm not sure if you lose the weight because of increased T levels or something else. Of course- like a vitamins & supplements- nothing's ever guaranteed.

Thanks Radar, actually I found that quite helpful...

I've been "considering" supplements for a good.. oh.. two or three years..
I think Zink was mentioned somewhere as a potential "help" for people with fibromyalgia too.. so now I've got two reasons to look it up. (could stand to loose 10-30 lbs...)