I posted this to answer someone else but wanted to share my answer with you too.
My dietician said hair supplements & collagen DO NOT WORK! Stop wasting money & time with them.
Said collagen is empty calories. And on supplements, just because it says “hair doesn’t mean that’s where your body will apply it. Your body will use it where it’s needed & hair generally isn’t the priority to your body.
PROTEIN is the ONLY thing that will keep you from suffering from hair loss. So meet your protein goals as set by your doctor (usually 60-80g protein/day for women, 70-90g for men).