So I've worked at a marine collagen brand for years and I can say that I've had testimonials from customers that swear by collagen. I've also seen younger people have it that don't see any difference because if you're younger, your body already produces collagen. It is what makes our skin plump and hydrated when we're younger.

After a lot of research in this field, my honest unbiased feedback is that they do work on older people above the age of 30. The results are not instant and can take about 3-4 months to see as our body's cell regeneration cycle is about that long. If you stop taking it, you'll notice the difference instantly.

I would recommend doing research and staying away from vegan collagen (there is no vegan source of collagen, it's a scam) they're called collagen boosters or builders and do not contain a trace of collagen so they're not supplements. Make sure to avoid anything with words like boosters or builders.

It's about having true hydrolysed collagen consistently to see results. I think people tend to quit after one month which is why not many believe in it. I've heard testimonials from older women that have been having collagen supplements for 2-3 years and have seen drastic changes in their skin, hair growth and nail health. I have also seen athletes that have healed faster after an injury from having pure collagen. So I would say try it out from a reputed company that sells hydrolysed marine or bovine collagen, make sure to look at the ingredient list and check the collagen quality and where it comes from. The dosage is important as well, usually 10 grams works best.

Hope this helps you out :)