The supplements I have been taking are:

B-complex 100
Algal DHA (900 mg)
D3 (2,000 units)
Acetyl-l-carnitine (500 mg)

I subjectively feel that these have been very helpful, but I suppose it could also be placebo effect. Frankly, at this point, I don't care if it's a real effect or placebo effect as long as I feel better.