A wide range of ingredients help support healthy immune function, companies claim—including probiotics, herbs, vitamins and specialty ingredients like noni juice and immunoglobulin. But in the U.S., marketers can only hint at product benefits, which from the consumer point of view run a rather confusing gamut from general health enhancement, to resistance against chronic auto-immune diseases to cold and flu prevention.
In Canada, where natural health product (NHP) regulations impleme
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