Youtheory Collagen Advanced 1, 2, 3, arrived quickly. I have been using it just recently and have found my nails, growing very fast and my skin seems smoother. I haven't noticed any changes in my hair yet, but will update review once I start to see a change. The pills are rather large, but I have had larger so these are okay to handle. You need to take 6 at a time or you can stretch them out over your day. I love that they are made from the collagen of (bovine and chicken). Besides the pills being a little large, these are worth it. I highly recommend these to anyone looking for a really good collagen blend.