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.
Symptoms vary based on the location and rate of blood loss. Slow internal bleeding can cause the gradual onset of anemia, resulting in energy loss, tiredness, shortness of breath, and paleness. Gastrointestinal bleeding may cause blood in the stool or vomit. Similarly, urinary tract bleeding can make the urine bloody.