e200921c_sity_of_Michigan_Health_System__Why
[Supplement] 1 Star Sea Buckthorn Refer to label instructions [Why] 
Sea buckthorn has been shown in animal studies to have immune system-enhancing and anti-inflammatory properties, though a clinical trial did not find benefit. Sea buckthorn has been shown in animal studies to have immune system-enhancing and anti-inflammatory properties that might help prevent or relieve the common cold.69 However, in a double-blind trial,70 healthy people who consumed 28 grams per day of pureed sea buckthorn berries for three months had the same number and duration of common cold episodes as a group consuming a placebo puree. Sea buckthorn does not appear to be effective for preventing or relieving the common cold.
Common Cold/Sore Throat (Holistic) | University of Michigan Health System
Why