Nutrient Sulfur Magnesium Potassium Related nutrients Protein metabolism. Copper. Phosphorus (DNA) Thyroxine. Phosphorus Amino acids Zinc Carbohydrate metabolism (DPN and TPN) Manganese CHO, fat, and protein metabolism (as enzyme activator) Biotin Choline Krebs cycle Amino acid deamination Transmethylation Lipid metabolism Methionine Vitamin E Inositol Fatty acid metabolism Vitamin A Thiamine Fat metabolism Choline Vitamin E Pyridoxine Riboflavin Protein metabolism Trypthophane--Niacin Fatty acid metabolism Thiamine Niacin Protein metabolism CHO metabolism Phosphorus metabolism Thiamine PGA (Folic acid) Vitamin C Pantothenic acid Methionine Cystine Pyridoxine Tyrosine Vitamin C Tyrosine PGA Vitamin B Protein metabolism Ascorbic acid