I wouldn't class your initial comment as a troll, and with a little bit of context, philwelch's commentary could have been pretty useful.

Kurzweil might not be so far ahead of "modern medical institutions", but it's easy to see why he differs from most doctors: he's doing math on a very different scale. Kurzweil's endgame is immortality via Singularity, and that affects his expected utility greatly. He actually gains when he spends two hours and ten dollars to gain one hour of expected lifespan when he has the expectation of eventually going infinite on lifespan via non-nutritional means. Most doctors, and most patients, don't expect the same eventual Singularity that Kurzweil is betting on, and without that expected payout, the supplements very likely seem ineffective in both time and cost efficiency. Most doctors seem hesitant to recommend courses of action that don't introduce significant qualitative (e.g., diabetes vs. no diabetes) or quantitative (orders of magnitude) returns.

(There's also the bit of cognitive dissonance where doctors are fine with heart transplants, but less fine with things that "artificially" extend lifespan or otherwise mess with our "natural" life.)