Recently purchased this to use on my Schecter Hellraiser Hybrid PT-7 (Ebony board). I used to experiment with cold press essential oils made from lemon, citrus, mint and grape seeds for an alternative fretboard care oil. I'd even written an article about this.
Almost all the other products (except MusicNomad F-One Oil) in the market are petroleum-based oils with added synthetic lemon (Limonene) molecules. (Check out my article on Google by searching my nickname).
Sandberg Fingerboard Oil is the real deal people! You will notice the smell right after you open the lid. It smells like nature (I believe it's mostly based on lemon peels by a cold-pressed extraction).
You will even notice from the image photos that it's not a clear oil, just like natural cold-pressed olive oil. It precipitates. :)
If you are picky about what you put on your guitar fretboard, this is it! 100% recommended by a guitar nerd! :) Cheers Osman