ABSTRACT: Dairy products. such as whey proteins. have been effectively used to enhance the effectiveness of vitamin D (VD) fortification and optimize circulating 25-hydroxyvitamin D [25(OH)VD] levels. Whey protein is rich in l-cysteine (LC) which is the precursor of hydrogen sulfide (H2S). https://thebrickes.shop/product-category/small-animal-habitats/