Best source of Caffeine for eye creams
I am doing some formulation on an eye cream and I am having trouble with the Caffeine source, I don’t know what is the best or cleanest source, coffee, tea, synthetic, etc. I can’t find much data and most ingredients just list “caffeine”.
Also not sure on a proper dosage. I don’t want to over or under dose it.
I have tried some of the coffee extract from one of the online ingredient sources but it is pretty brown and tinted the cream a little too much.
Thanks for any advice.
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