Numerous MLM companies are selling a variety of beverages and products
based on their respective ORAC values, "immune-stimulating
polysaccharides", the "incredibly potent antioxidant power of
xanthones", and almost universally, their supposed ability to
strengthen and improve your body's immune system.

My question:

Is there any scientific and objective way to determine the strength
and condition of your immune system? And if there is, could this
determination be used to verify the efficacy of ANY of these products?

Or is advertising a product's ability to "strengthen your immune
system" simply a clever way to avoid ANY scientific challenge or
FDA/FTC inquiries?

Thank you.

Robert Burtis