Brewer's yeast is a byproduct of brewing beer. It's commonly used in pet supplements due to its various health benefits:

Nutritional Value: Brewer's yeast is rich in many essential nutrients, including B vitamins (such as B1, B2, B3, B5, B6, and B9), protein, and minerals like selenium, chromium, and zinc. These nutrients are important for overall health and can contribute to a shiny coat, healthy skin, and strong immune system in pets.

Digestive Health: Brewer's yeast contains probiotics, which are beneficial bacteria that support digestive health by maintaining a healthy balance of gut flora. Probiotics can aid in digestion, improve nutrient absorption, and reduce the risk of gastrointestinal issues such as diarrhea and constipation.

Flea and Tick Repellent: Some studies suggest that the taste and odor of brewer's yeast can help repel fleas and ticks when consumed by pets. While not as effective as topical flea and tick treatments, incorporating brewer's yeast into a pet's diet may provide some additional protection against these pests.

Energy Boost: B vitamins found in brewer's yeast play a vital role in energy metabolism, helping pets convert food into energy more efficiently. This can lead to increased vitality and overall energy levels in pets, making it particularly beneficial for active or working animals.

Skin and Coat Health: The nutrients in brewer's yeast, especially B vitamins and minerals like zinc, are essential for maintaining healthy skin and a shiny coat in pets. Regular supplementation with brewer's yeast may help alleviate skin conditions such as dryness, itching, and dull coat.

Immune Support: The immune system relies on various nutrients, including those found in brewer's yeast, to function optimally. By providing essential vitamins, minerals, and probiotics, brewer's yeast can help support the immune system and enhance the body's ability to fight off infections and diseases.

When using brewer's yeast supplements for pets, you should choose products specifically formulated for animals. Additionally, pet owners should be aware that while brewer's yeast is generally safe for most pets, some animals may be allergic to yeast or may experience digestive upset if given too much.  Always speak to your veterinarian before giving your pet any new supplement or food.