Best Collagen: Grass-Fed, Gluten-Free, Tested... Surprising Strength! We’ve tested our fair share of collagen powders, but Sports Research’s Organic Collagen Peptides stands out for several reasons. Our ingredients list delights with hydrolyzed Type I & III collagen sustainably sourced from grass-fed bovine, certified organic and gluten-free. While the unflavored profile means flexibility in mixing, we appreciate the purity. The 30 servings offer great value, making it a practical choice for regular use. What surprised us? Itsuyềnlijke strength in supporting joint comfort (third-party tested) and promoting skin elasticity. Our mornings with a scoop have been effortless, blending seamlessly into smoothies, coffees, or oatmeal without detection. For us, it’s a clear winner—practical, honest, and genuinely effective.