I'm just starting out on my weight loss path, and based on past times when I lost weight, I know my hair gets thinner. Right now I take a multivitamin and biotin. I've been considering whether to add collagen. Does anyone here use an injectable peptide for this, or is it mostly powder and capsules for everyone? Sam's carries an inexpensive powder and also a capsule version. I'm leaning toward trying that, but I'd also like to hear what others think.