Biotin although I haven’t had any hair loss and hope I don’t. However my forearms are a disaster now because my skin has become tissue thin. Wearing elbow length fingerless gloves my daughter got me to try and protect myself from looking like I’ve been in a fight with a grizzly bear. She found me some cream for fragile skin too so maybe it will help. The photo shows how dreadful my forearms and tops of my hands are. My other arm is actually worse than this one. I’m embarrassed to go out in public but I live in the Deep South and it’s soooo hot and humid—-too hot and humid for long sleeves right now.