I have been taking Great Lakes hydrolyzed collagen also and had no problems with it. I usually have two scoops a day at two different times in a liquid. I buy the 8 pound bags and was told about it by a naturopath.
HI, I have been taking collagen for my hair. Bullet proof in powder form. I put a scoop into my coffee in the morning and I notice my hair falls out less, is thicker and grows faster. If I stop taking it about 4 days later I start to notice my hair goes dull, limp and feels thin. It's great stuff