I'm not so sure that mutton tallow has any lanolin in it. Lanolin is an oily secretion onto the skin of the sheep to help waterproof the wool and keep the skin supple. I think it is a byproduct of wool production and used in human skin preps.
I would also think that sheep fat, whether it is around the kidneys or under the skin that fat tissue is fat tissue and the oils within are going to be the same whether internal or external. Just my thoughts. I'd say use it all, why limit to just one part of the body?
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