Present in the mitochondria of every cell, coenzyme Q10 is an essential factor in ATP production. The need for Co Q10 appears to be greatest in metabolically-active cells such as in the heart, gingiva, immune system, & gastric mucosa. Co Q10 is also an an woman who is pregnant or nursing, or who might become pregnant, should consult a health-care practitioner before using this product.1 to 2 capsules bid