The effect of vitamin C supplementation in healthy dogs on antioxidative capacity and immune parameters (2009, Veterinary Immunology and Immunopathology)
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Benefits claimed: Oral supplementation (30-60 mg ascorbic acid) showed a trend toward increased plasma vitamin C levels, an increase in CD4+ T-lymphocytes (key for immune response), and modulated peripheral blood mononuclear cell proliferation in response to mitogens, suggesting mild immunomodulatory effects.
Vitamin C in Health and Disease: A Companion Animal Focus (2020, Topics in Companion Animal Medicine)
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Link: https://www.sciencedirect.com/science/article/abs/pii/S1938973620300301
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Benefits claimed: Vitamin C supports tissue growth and maintenance, reduces oxidative stress, enhances immune regulation, and acts as a cofactor for catecholamine and vasopressin production.