I use Creatine HCL (2-3 grams per day) and protein blends with my clients. I like Raw Dynamix brand.
Problend is also my go to. It's a 4 blend of protein, egg, whey, casein and hydrolized protein. Which is great for a bulk or cut. Try the Blueberry Muffin flavor. You will thank me later! gymntonic.com is a source of both of these products.
Otherwise like Lean Engineer said a good fish oil always has multiple benefits.
I use Pine Pollen tincture daily as a basic supplement too. It's dirt cheap and it boosts Free test levels a little bit, it gives better libido and erections as well. It is a super food, so it has a ton of health benefits. It's definitely a staple for me that is very affordable.