How We Found the Best Testosterone Booster. We started with a list of 214 testosterone boosters, found in their natural habitats on websites like Bodybuilders.com, BroScience, and The Art of Manliness. These supplements are marketed almost exclusively to men looking for that extra edge in the weight room, the bedroom, and the mirror.
1 These are common and often don't cause symptoms, but may lead to a small amount of blood in your stool.  sexually transmitted infections (STIs) â any sexual activity involving the anal area can spread STIs, which may sometimes lead to rectal bleeding.
Bloody stool (stool that is very red or has streaks of bright red blood in it) is called hematochezia and usually originates from the colon or rectum. Melena on the other hand, is generally caused by bleeding within the stomach or small intestine. Various Causes of Black Stool. But what causes this upper digestive bleeding in the first place?