| i cant speak to spirinula as i haven't really researched it.
but for garlic, this is not snake oil. it is proven that garlic can and does increase white blood cell count, and acts as a natural antibiotic. this is true is humans also.
now that said, what is anecdotal, is how effective it is on treating disease, or preventing disease. common sense dictates it would make the fish healthier and thus keep them less prone to sickness. but it has not been show scientifically (anywhere i have seen) that it actually works.. kind of a hard thing to test
all that said, i do use garlic extract to soak all my food, and have been happy with it.. but that's hardly scientific proof.
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