I only take whey protein and pure creatine monohydrate. These are two of the very few supplements with actual science backing its efficacy. My training load also isn't that high (only about 8 hours per week), so strictly speaking I don't need any supplementation if I eat a balanced diet. But I back the science of creatine and I enjoy snacking on protein shakes.
I try to solve for purity and price, and I've found that My Wellness has an 75% purity whey product for under R0.40/g protein. Then I try to look for 500g pure creatine monohydrate for around R300.
Some more of my beliefs.
Unless medically prescribed, most supplements have no benefit, apart from placebo.
Supplements should not take the place of the unsexy basics of consistently doing the right things (7+ hours sleep, balanced diet, community, strength, cardio, flexibility).
Very keen to hear other hubbers knowledge on this subject, I know very little.