Multivitamins: They may help some, but there is no hard evidence to suggest that they definitively impact overall health. For those who meet nutrient needs through diet, a multivitamin won’t do much other than creating colorful, expensive urine.
Vitamin A: Found in foods like cheese, yogurt, and eggs, most people already get lots of vitamin A from their three meals daily. So, if you take more than you need, your body could undergo vitamin A toxicity, which is not that hard to accomplish.
Kava: While some studies have shown that it can treat anxiety to some extent, there’s no other proof to show its effectiveness in treating other conditions. In fact, an excess amount can result in liver damage.