Pure Ester-C®Benefits Delivers Total Body Support Helps maintain a healthy immune system and response. Helps aid in seasonal and occasional allergy relief Helps aid in joint and bone health Helps aid in antioxidant support Immune Boost Ester C for Immune Support Wholistic Ester C is a patented, non acidic, Body Ready form of Vitamin C that is easily absorbed for maximum effectiveness over other forms of Vitamin C. Dogs do produce some Vitamin C, but not nearly the