Bogosity!

The dietary supplement industry is huge (as in $BILLION$ in profits), and most of the money foodies and foodie victims spend on these very expensive capsules, tablets, and powders is wasted or goes to fund whacko organizations that prevent people from getting real preventive health care.

People think these items are controlled by the FDA, which they are not. (Congress caved to the supplement lobby over a decade ago, classifying these things as food. Probably some nice bribes and kickbacks were spread around to the almost universally scientifically illiterate Congresspersons there!)

The health claims made are outrageous (and reversed,right on the packaging, through the use of asterisks, daggers, and nanoprint), the "science" absent, terrible, or "pseudo", and even so they don't address the major dietary problem we have in this country--obesity (despite the ridiculous claims about "fat burning", which my nutrition class demonstrated is physiologically impossible this side of absolute starvation). 
Antioxidants, beloved of foodies everywhere, can actually kill (by interfering with cellular energy production), cause anemia (through blocking effective oxidation of iron in hemoglobin), or increase the aggressiveness of cancer if taken in excess, and there is essentially no data to support that they prevent anything! Some supplements, especially those with fat-soluble vitamins and heavy metals, can kill directly if taken in excess.

Buyer, beware, indeed!!