Lots of folks are peddling the CBD oil...which I believe is derived from hemp. Marijuana has two major components in it. CBD and THC...both have therapeutic properties. IMO, the THC is the most therapeutic, but it's also the component in mj that makes you high and will fail you on a drug test. CBD is perfectly legal, but I think it's effects are much less noticeable and anyone who thinks it helps "tremendously" are more just victims of the placebo effect.
Disclaimer: Please do not follow me into any trades without verifying their potential for yourself. While I often feel like I have a good handle on things, my track record says differently.....