I Have a 18 year old gelding and I thought that Maybe I should start giving him some MSM. I just want to help him if he starts feeling his age, at this point he acts like hes 10 or so. Is all MSM the same, or what would be the best I would perfer using the crystals . Thank you

Supplements are really a trial an error for what works best for each individual horse.
I however do feed my entire barn MSM-I've had good luck w/ Ani-Med crystals 2 lbs $9