I just wanted to echo what Dan said, a 10% solution is pretty strong and contact to essential oils in high doses can lead to sensitization, better stick with around 3%.

I have written a bit about different beard products here:
moustache cups and mugsbeard brushes and combs
beard literature | simple homemade beard oil

my beard journey | my bart * aber herzlich beard oil | Bartöl store (external link, not affiliated with or endorsed by beard board)