Last but not least on the list of the best Bodybuilding Supplements is fish oil. Though it isn’t fancy, and though it doesn’t directly help you build muscle mass, it can be invaluable for your overall health. What I like best about it is its anti-inflammatory properties. Whenever I have a little joint pain, I pop a few fish oil caps, and I’m good to go by the next day. This is great for allowing me to continue training hard.