Tried marine gem and stem cell Marine gem tasted like lychee. Stem cell series tasted like berries. Another one I forgot the name from kinohimitsu too , not added flavouring , cheaper, but have fishy smell I tend to add it in coffee to drink

my acne scar do faded a lot after consuming collegen from multiple brands. I brought whichever have offers and trusted brand. So I'm not sure which brand contribute the most. But collagen supplements does it works.

I always purchased extra when there are sales.

For example kinohimitsu marine gem, possible to get it RM98 a pack (2 months supply, take once alternative day)
Not expensive. If you have higher budget, you can get different series with higher dosage.

According to the aunties, chicken feet do have a lot collagens. But not sure contains a lot fats as well or not from the skins.
For non-muslim, pork hand and leg too. When you make broth.
Fish collagen is more safe to use overall I guess.