The alternative vegan collagen is a precursor of collagen that perfectly imitates the amino acid pool of human collagen. With sweeteners. 1 Vegan Collagen Alternative 15 sachets. The components present in Super-Cal can promote normal bone maintenance (Calcium, Vitamin D and Vitamin K), promote normal absorption of calcium and phosphorus (Vitamin D) and contribute to the normal formation of collagen for normal bone function (Vitamin C).