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If you have health insurance, consult with your general practitioner and get blood work done. You need to know what supplements you do and don’t need before you start comparing brands, the fat-soluble ones can seriously harm you if you take more than you need.
Consumer Lab is a valuable resource for comparing brands. They test supplements to make sure they actually HAVE the ingredients they claim, and to make sure they DON’T have anything they shouldn’t (heavy metals, etc.). It also links to studies and lists contraindications.
You have to sign up to see the really good stuff, but you can do so for free.
Stick with creatine monohydrate and a good whey protein. All the other stuff is mostly marketing fluff. Nutrition is much more important, though. Eat a healthy diet, and drink some protein/creatine to hit your daily protein goals. Add in plenty of water and good sleep, and you’ll see results.
I’d start with vitamin D personally, which is about the only universal supplement I’d recommend to everyone. It’s simply not possible to get enough from food sources or from the sun in a vast majority of climates. So I’d start there, followed by magnesium which is also something a lot of people tend to be deficient in. Can’t do much harm with probiotics either but I’m not really as knowledgeable on that subject