Can you make tincture for under the tongue with propylene glycol?

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Trinny3628

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I started a round of tincture with 2oz of bud and 3 cups of propolyene glycol, is that okay to put under the tongue or should I make them into something else?
 
NorthernOrganics

NorthernOrganics

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"The Food and Drug Administration has classified propylene glycol as "generally recognized as safe," which means that it is acceptable for use in flavorings, drugs, and cosmetics, and as a direct food additive."
 

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