Wholistic Pet Organics Ester-C Powder for Dogs & Cats – Cat & Dog Allergy & Itch Relief – Vitamin C Immune Support Supplement – Itchy Skin Support for Seasonal Dog Allergy Relief – 4 oz – 113 Scoops

Customers report that the vitamin C supplement helps with allergies and phlegm in dogs, while being easy to use and digest. The product receives positive feedback for its effectiveness, particularly when combined with colostrum, and customers appreciate its quality and vitamin C content. While many find it pricey but worth the investment, opinions about durability are mixed, with one customer reporting it turning into an unusable brick.