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Dr. Wesley, who also reviewed the list of some 200 ingredients posted on the website, said that some of them, including aminomethyl propanol, a product stabilizer, do penetrate the skin’s uppermost layers.

In a May 2018 analysis in Joule, Sargent and colleagues found that under stricter market assumptions, including an electricity price of 2 cents/kWh, synthesizing formic acid, ethylene glycol, and propanol would all be feasible.

When the experiment was repeated using propanol—a larger alcohol with less hydrogen bonding in the mixture—optical distillation produced the same result as thermal distillation.

Other industrial chemicals the lab have found include propanol and methanol.

Genetically modified versions of the organism can produce butanol and propanol, two high-energy building blocks for transportation fuels.