People don't realize that all those 'natural' substances are just chemical substances with a living source.
As for lime and lye; these are materials for processing since ancient days. Lime, made from limestone, has been used as a binding agent since Ancient Rome, if not earlier. Lye made from wood ash has been a key component of soap production since soap started being made. The fact that our ancestors knew of them and used them does not make them natural, nor does it make them safe.
Chemistry doesn't care how you got a substance. Only that it's there.
As for lime and lye; these are materials for processing since ancient days. Lime, made from limestone, has been used as a binding agent since Ancient Rome, if not earlier. Lye made from wood ash has been a key component of soap production since soap started being made. The fact that our ancestors knew of them and used them does not make them natural, nor does it make them safe.
Chemistry doesn't care how you got a substance. Only that it's there.