I`m a male, 50 yrs. old. I was told prenatal pills were alright to take as they are loaded with vitamins and minerals. The last three weeks I`ve been very stiff, my back, my legs and knees. I am extremely active, mountain biking, road biking, weight lifting and kayaking, but lately have been too busy to stick to my routine like I usually do. So after two weeks of the stiffness/soreness I purchase these prenatal pills, took one per day, and buy the third day the soreness and stiffness has greatly diminished. To note, I am very skeptical of these types of things, but I can honestly say this is working. I have to study this a bit more to make sure this isn`t harmful, maybe just low doses of iron would work also, I don`t know.