The FDA says you can intake 23mg per kg of body of propylene glycol.So, the nonactive ingredients: alcohol, propylene glycol, etc. are safe to consume? Probably not ideal tho
And I’m pretty sure the alcohol you are referencing is ethanol.
You’re fine. The real issue is ensuring the dosage is accurate each time if you are using a dropper.
Just google it if you’re serious about it. People are doing it.
Personally, I’d stick to topical minox. Orally can promote hair growth all over. I’d like to control where that growth is promoted.