How to Increase Your Testosterone | The Art of Manliness
“Researchers in the US are finding testosterone levels to be substantially lower — by about 15 to 20% — than they were fifteen years ago. Scandinavian studies show similar declines, and in younger men too; a man born in 1970, for example, had about 20 percent less testosterone at 35 than a man of his father’s generation at the same age.”3
Day 4
