Dose & Co is NOT cheap collagen. So after a few years (with a full head of healthy hair), I got onto Amazon and ordered a collagen for half the price. Not realizing the new collagen had near toxic levels of vitamin E, in addition to the vitamin E face cream I use, I started experiencing severe hair thinning (like 3/4 volume lost, no exaggeration). After (recently) noticing the vitamin E and throwing the cheap marine collagen in the trash, I immediately went back to Dose&Co and am just now (the last few weeks) starting to feel like maybe I didn't cause complete and permanent hair loss. LESSON LEARNED.