Thiamine, or vitamin B1, is a water-soluble vitamin whose molecule contains pyrimidine and thiazole cycles. This vit...

Vitamin A is an essential nutrient and fat-soluble vitamin. In nature it occurs in the forms of retinol, 3-dehydrore...

Protein, fat, and carbohydrates are the main macronutrients. Proteins are biopolymers based on amino acids interconn...