There are certain vitamins, such as vitamin C, that are important for your body to maintain proper collagen levels. However, it's important to understand that the human body is a complex piece of machinery and vitamin C isn't the only component needed to make collagen. That's why I recommend against supplementing with synthetic vitamins. Instead, you should aim to obtain most of the micronutrients your body needs from whole food sources, including organ meats. For example, beef spleen is an excellent source of highly-bioavailable vitamin C! If you can't stomach the taste of organs, you should consider freeze-dried organ meat supplements.