Lack of collagen can literally be observed in the mirror. Deficiency of collagen is revealed by flabby skin, wrinkles, weak nails, breaking thinning hair as well as musculoskeletal pain. If you have at least 2 of these symptoms, it is highly likely that your body is calling for collagen. During autumn and winter, hair, nails and skin are also stressed by frequent temperature changes, cold, lack of sunbeams, but also by poor quality food. The skin is dehydrated and reddened, dry hair with split ends and brittle fingers in gloves do not help healthy looking nails. Loss of collagen has a big impact on how healthy we look and how we feel.