K&B vs PG/ethanol solution

patienceiskey

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Which vehicle is better for RU?

The K&B solution:
a combination of ethanol, distilled water, emulsifiers

The PG/ethanol solution:
a combination of ethanol and propylene glycol

By better, I mean which has a greater absorption of RU to the scalp, and which has a greater length of shelf life?
 
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