Karen Herløv Horte wrote:
The muslim community swears by Argan oil but I think it has more to do with regional availability than any actual super powers of the oil.
I'd vote for Argan Oil as well, to keep the beard moisturized and not oily. The good thing about Argan oil is that this oil is not greasy, and the skin/hair absorbs it quickly. So it's nourishing for the skin and the hair follicles. I would go for Castor oil is i want more volume. And even mixing both with some essential oils for a good smell would be a good option.
I personally did some research about Argan oil and it only comes from where i used to live for a while (Morocco). Good luck in finding a pure Argan oil, it's rare and expensive.
If interested in more about this oil, here is an article that details a lot about it :
https://www.frommoroko.com/argan-oil-benefits-origins/