Yes, vitamin C can help the absorption of collagen. However, you don't have to buy vitamin C deliberately, just eat fruit. For collagen, I agree that pure collagen powder is better, and tablets and capsules also need different contents, 500 mg each and 750 mg each. 1000 mg each, you choose, I think it is more convenient (if you want to take it out), and you also bought a can of collagen powder specially, which is not delicious and troublesome. On the contrary, I think liquid is the most cheating. A bottle is 95% water, and it will be expensive to add some things like collagen.