Do the tanning oils sold in salons really make a difference?

I was wondering if they really do speed up the process of your tanning by making you darker faster, or if it's just a quirk to get a few more sales.





And if it really does work, which brand do you recommend?Do the tanning oils sold in salons really make a difference?
Yes they do work. I don't know of a specific brand that stands out, though.





P.S. Please don't tan! Sooo damaging!