Men's Daily Vitamins
Echinacea appears to be somewhat effective for fighting off upper respiratory tract infections (mostly studied for the common cold), and when taken consistently as a prophylactic, it has support from research. It has also been studied for its potential ability to accelerate the rate of recovery in sickness.
Biotin is an essential vitamin that has been grouped with the B-complex vitamins since it was discovered, in yeast alongside other B vitamins. Although it is technically known as vitamin B7, this designation is not too common as it is usually simply referred to as biotin.
Any benefits of oral zinc supplements or increased dietary intake will depend on the zinc status of the individual. Some research suggests that when zinc levels are low, insulin sensitivity and testosterone can decrease, and supplementation can bring levels closer to normal.
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