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On the question of optiphen, I use it in my lotion. I haven't made lotion in quite some time, but if I recall correctly, it needs to be added below a certain temperature, requires a certain ph range, and can seperate some different products. I've never had problems with it in my lotion, however. Search it out on soap queen, and definitely familarize yourself with swift crafty monkeys blog. It has much better details on preservatives and their best uses in which products etc.
Edit to add, I've read about small time soapers making health claims on their eo blends get taken by the fda. Honestly, their fines can be steep. Optiphen is probably a good choice, but research the stipulations ie ph range temps etc.
Edit to add, I've read about small time soapers making health claims on their eo blends get taken by the fda. Honestly, their fines can be steep. Optiphen is probably a good choice, but research the stipulations ie ph range temps etc.