Holland & Barrett Bovine Collagen Effervescent 1000mg Provides a convenient effervescent drink format delivering high-quality bovine collagen alongside synergistic skin-support nutrients. Collagen is the most abundant protein in the body, making up approximately one third of total protein content. Collagen production naturally slows from our mid-20s. Vitamin C contributes to normal collagen formation for the normal functioning of skin. Zinc contributes to the maintenance of normal skin. Hyaluronic acid supports skin moisture retention.