India, Aug. 1 -- Dr Kiran Sethi, another dermatologist, offers a more measured take.

"Beer has anecdotal evidence but no scientific backing. That said, it contains proteins, amino acids, sugars, B vitamins, and has a low pH, which can theoretically improve shine and strength," she says. She recommends using beer sparingly, perhaps once every few weeks as a rinse after shampoo, left on for a few minutes before washing off. "I would only use it for dull hair and a lack of shine. I wouldn't use it for anything else." She says.

When it comes to skincare, Dr Sethi again stresses the lack of scientific support. "The most important benefit it may have is from yeast, or saccharomyces (a sugar fungus). It's a good bacteria that might soothe infl...