Almost a decade ago, Leonard Guarente at Massachusetts Institute of Technology found a gene called SIR2 in brewer's yeast that, when mutated, seemed to extend the yeast's life.

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Some of the sugar can't be digested by brewer's yeast.

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Any normal brewer's yeast can be used in his process but the lifespan of the yeast is much longer than in traditional processing, where yeast degenerates after three brews and starts to affect the quality of the beer, says Heiliger.

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Beer naturally contains a shot of B vitamins. (Not coincidentally, vegans get excited about brewer's yeast.) This entrepreneur isn't the first to see nutrition as a selling point for booze: During World War II Anheuser-Busch advertised Budweiser as a natural source of B vitamins.

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Beer naturally contains a shot of B vitamins. (Not coincidentally, vegans get excited about brewer's yeast.) This entrepreneur isn't the first to see nutrition as a selling point for booze: During World War II Anheuser-Busch (nyse: BUD - news - people ) advertised Budweiser as a natural source of B vitamins.

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