I have been using this collagen for about 6 months now (possibly a little longer, I don't remember exactly). Firstly, I want to mention that for a few months before starting this, I was taking collagen from Natura Vita which didn't do anything. This one from Medichrom has helped me a lot and I understand that the results are due to it because I was already taking supplements for skin and hair, such as vitamins C, E, and D. In combination with facial care, I have noticed a difference in fine lines and overall skin elasticity. Additionally, hair has started growing again in areas where it had become weak. To conclude, no product works miracles. The differences I saw after taking collagen were noticeable mainly to me in the mirror and not to others (as I always looked much younger than I am and the improvements I wanted to make in my appearance were details). I mention all this because perhaps someone expects collagen supplementation to work like a cosmetic procedure, which is not the case.
*Update* I have been using it for about a year and a half now. In the past few weeks (I think since the beginning of 2024), I started increasing the dosage to one and a half capsules per day, which I took all at once, while in the last 2-3 weeks, I take one in the morning right after waking up and one at night before going to bed, both with half a liter of water. I don't want to increase the dosage any further, as I am already taking twice the recommended amount, mainly because one dose doesn't contain enough hyaluronic acid. I just want to note that for all this time, I saw the biggest effects of the supplement on my hair, but now they are also quite visible on my face (at least to me, as I pay very close attention to every detail). However, every organism is different, so don't assume that the effect on yours will be the same.
*Update 2* In the past week, when I stopped shaving my beard, I noticed that the 4 white hairs that I had noticed a few months ago and had started to worry about are no longer there. Also, there is no longer a specific number of white hairs in areas where I had noticed their presence. Additionally, regarding my hair, when I was 21, I noticed that my hair was gradually thinning on the forehead and above the cheeks. Now, after about a year and a half of daily collagen intake, my hair is almost back to where it was when I was in high school (I estimate that by summer, it will have fully recovered everywhere).
Note 1: Yes, the taste is not the best, but why would you expect it to taste good? Just swallow one capsule and drink water, it's neither juice nor a soft drink, it literally comes from fish skin.
Note 2: Like any supplement, collagen also requires time and consistency. Combine it with some kind of cod liver oil/fish oil/vitamin D for maximum results.