When they add nothing, as lambic-makers do, the untreated wort becomes a refuge for airborne wild microflora, which now have space to grow and food that would otherwise be hogged by beer yeast to eat.

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But back to our beer yeast dilemma.

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Egg whites have been used in other cultures for centuries, and we know that the yeast from the beer in combination with that would create a really nice tightening effect on the skin.

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"We tend to think of mushrooms on toast or yeast in bread or beer, but they do so much more for us than that, " he says.

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The molasses is mixed with water and yeast and is left to ferment (beer).

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Advances in science made it possible to isolate a strain of yeast that results in a lighter-colored beer with a cleaner, crisper flavor.

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Brewers typically make beer by fermenting a sweet, grainy nectar called wort with specific strains of yeast.

WSJ: The Sour and the Glory of Beer

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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