9. CAUTION: Chasteberry (Vitex agnus castus) . Chasteberry has been shown in several in vitro studies to bind to dopamine receptors in pituitary cells.  It also has a history of being used in women for hyperprolactinemia.  Unfortunately, there appear to be no studies on men and, at least in women, it has some unusual affects such as increasing progesterone and LH (leutinizing hormone) while decreasing FSH (follicle stimulating hormone). In my opinion, this seems like an unpredictable mix of effects for long term usage.
NOTE: Some have argued that fish oils are oxidative upon digestion and that fish oil thus probably does significant aging and cellular damage internally that we may not yet understand. However, several studies suggest this to be a relative non-issue.  In addition, one study also found that additional Vitamin E can protective help overcome most of the small amount of oxidative damage that is done anyway. The study authors found that oxidative products in the urine "more than doubled when the fish oil capsules were introduced but then dropped by a factor of four when vitamin E was added. The vitamin E concentration in the red blood cells dropped very significantly when fish oil was ingested but more than recovered with the vitamin E supplement".