Collagen is the main structural protein that forms our body's connective tissue—such as bone, skin, cartilage, and tendons. Research shows that collagen loss starts between the ages of 18 and 29, after age 40, the body can lose around 1% per year; at around age 80, collagen production can decrease 75% overall in comparison to that of young adults. Therefore, it is very important to supplement collagen. Consuming collagen peptides supplements may help with skin elasticity, stronger bones, pain-free joints, and a more secure gut lining. Common collagen brands on the market are Vital Proteins, Ancient Nutrition, NeoCell, and Bulletproof. But which one is the best? Here we've gathered the advantages & disadvantages, customer services, promotions, and best sellers of each of these brands to help you pick a winner.

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