Brewers yeast, desiccated liver, and bone meal are good sources of some B vitamins, of important trace elements not included in the supplement formula, and of as yet unidentified nutrients. Yeast and liver are, in addition, excellent protein supplements.
One of the controversial questions of the day is how much vitamin C and vitamin E should be taken. Since these two nutrients are likely to be on the low side in many supplements, you may have to purchase a separate quantity of each to get at least 1000 milligrams of of vitamin C and 600 800 International Units of vitamin E daily. Recent evidence indicates that men need 2500 milligrams of vitamin C daily to protect them from the common cold; women need 2000.
Are there inherent dangers in taking large doses of vitamins? Can you take too much of any nutrient? Yes. You can take too much of anything, including water and air. Common sense would dictate that you can take too many vitamins.
The margin of safety is the point to consider. Fortunately, when it comes to vitamins, there is a tremendous margin. The few studies to date which seem to support a vitamin A and vitamin D toxicity potential used fantastically large quantities to demonstrate an ill effect. You’d have to sit down and plan your own demise to take a damaging dosage of these nutrients.