B vitamins are important for your pet’s brain, nervous system and immune function, energy production, cell metabolism, organ and tissue health, muscle, coat, skin and eye health, and much more. Low levels of B vitamins can affect your pet’s body in many different ways because of the vitamins’ far-reaching and interrelated effects. Because B vitamins are water-soluble and not stored in your pet’s body, he or she must get the entire complex through diet each day. B vitamins can be easily destroyed by high temperatures during processing, light, oxygen, and long storage periods. The words “complete and balanced” on your pet’s food label doesn’t provide a guarantee that the food actually contains enough of these essential heat- and light-sensitive vitamins to last the lifetime of the product. The nutrient profiles you see on food products are only minimum standards, and they don’t address the quality, the digestibility or the bioavailability of the nutrients, much less the optimal recommendations. Feed-grade synthetic vitamins are typically used to “enrich” pet food. The majority of these feed-grade premixes come from China and from questionable sources.