Collagen is our most abundant protein, accounting for around 30% of the protein content of the human body. Collagen gives skin its elasticity and strength. It’s inevitable degradation as we age causes wrinkles. There are anti-aging products that contain collagen (usually animal or fish derived), but I am not fully convinced that dabbing collagen on our skin, begets more collagen. However, there are clues as to what to look out for in the building blocks of collagen in our bodies. For example proline, an amino acid, makes up 17% of collagen; and vitamin C is important to collagen formation. Certain growth factors and synthetics peptides, such as Matrixyl, have research backup showing their impact on collagen production. So here are my Five Best with collagen-boosting actives.