It plays a major role in retarding the aging process, treating heart disease, preventing blood clots and therefore strokes in older dogs, disease resistance, healthy reproduction, and in protecting against the toxic effects of heavy metals. Although there are virtually no known side effects caused by massive doses of vitamin E, one exception is high blood pressure. Older dogs with impaired hearts may already have high blood pressure - they will benefit from vitamin E, so give low doses to start with, working up gradually the dose matches your dog's body weight. The B complex group of vitamins, like vitamin C, are water- soluble, meaning that you cannot overdose on them. Dogs with insufficient B vitamins are generally lethargic and lacking in energy, and may also be prone to be fatties.
B vitamins have a generally calming effect and help to fight stress.
They are involved in all phases of growth, reproduction and repair of body tissues, and are necessary for the health of the entire body including the production and maintenance of blood, skin, hair and sweat glands, as well as the eyes and tongue. Brewers yeast is an excellent source of the B vitamins, and it also contains Selenium which, again, boosts the immune system, treats arthritis, and prevents cataracts. The garlic will further strengthen his immune system, keep infections at bay, and it's also an excellent flea and worm repellent. Remember, commercial dog foods are designed for the average dog - and extra C and B will not harm him. Rather, they will help him to live to a healthy, pain-free old age.