LS! I take at least 30 supplements daily for about 25 years. I have written the whole list out before. I take supplements to reduce mortality. I also take supplements for my muscles:
For muscle strength and gain I take:
Daily 250 grams of protein
5 grams of creatine
5 grams BCAA
3 grams HMB
30 grams of whey protein
fresh organic broccoli sprouts 75 gram (blocks myostatin)
Solgar vegetarian multi
I have never taken supplements before.
I donāt think they will do anything.
Fish Oil
Vitamin D3
Magnesium
Multivitamin
Sounds like youāve got it all covered @solidus. You could add broccoli extract. 
Iām not sure if this is meant as a joke but, Iāve tried just about every supplement you can think of.
Iron (still take occasionally), L-Theanine, Magnesium (good for bone density), Saw Palmetto (Prostate support), L-Tyrosine (I warn others about this one as it is supposed to increase dopamine, norepinephrin, and adrenaline. I find it helps me stay focused.) I used to take L-Arginine for a workout pump but found out L-Citrulline - Malate is better and take that for my workouts now. 
I have D vitamin and multivitamin⦠but i forget to take it. I should take it cause i only eat dinnerā¦
Also melatonin and lteanin, for sleep, but i only have them for PRNā¦