"Bioavailability" means how effectively and easily a nutrient or compound is absorbed and used in the body. The more bioavailable something is, the more effectively the body can use and store it.
If a product does not contain bioavailable ingredients or isn't in a bioavailable form, it will be very little to no use for the body. This is why it's important to check the ingredients and the form of any supplements you give to your dog.
Another factor which will affect the bioavailability of any product (including food) is gut health. In order for food and supplements to be broken down effectively, the integrity of the gut lining and the stomach acid should be in good condition. The healthier the gut, the better the absorption. A healthy gut can be achieved by feeding a natural diet free from additives, preservatives and fillers.
As we know, processed food diets have a detrimental impact on our dogs digestive systems which ultimately has a knock on effect to other systems in the body, such as the immune system.
Supplements come in many forms and the most potent and effective form is a tincture. This is because liquids are easier to breakdown compared to tablets.