Calcium is necessary for muscular contraction. If adequate stores of Calcium are not available in the muscle, full, hard muscular contractions cannot be sustained. Phosphorus helps provide quick, powerful muscular contractions, which comprise the majority of movements during weight training. This nutrient is high in the list since bodybuilders typically avoid the fat content, e.g., dairy foods. Look for vitamin D fortified foods and get in the habit of drinking at least one glass of low-fat or nonfat milk per day.
Thiamine is one of the vitamins required for protein metabolism and growth.
Not only that, but Thiamine requirements appear to be directly related to caloric expenditure. The more exercise frequency, intensity and duration increase, the more Thiamine is needed. The more protein you eat, the more Pyridoxine you need. Of course, this, coupled with Pyridoxine's role in growth, had profound implications for bodybuilders, though it is generally not known or discussed in sports nutrition circles. Most athletes don't realize how important vitamin C status is to success.