Hi guys!
I wanna add my 0.05$ to this topic. Once again I will say, that supplements are just supplements to your regular diet and some kind of boost for what you are doing. And if you don't know why you need some supplement, you don't need it.
Regarding creatine, body can stores cca 115g of creatine. Creatine itself is NOT substance which gives you performance. With more creatine your phospocreatine energy system can work a little bit longer...just to make 1 or 2 heavy repetition more, or sprint 2 seconds more on full throthle. That's all logic behind it. And for sure, if you stop supplementing, your stores will be lover and your performance is therefore not permanent. Creatine monohydrate is most cheapest creatine, but it's absorption efficiency is quite low and most of it is flushed by urine from your body. About sense on taking it: if it helps to achive your goals ;)
About BCAA and glutamine. Once more, take it if you know how they benefit you. Currently I take BCAA in my preworkout shake and since that I don't have any soreness after workout. My only indicator of workout efficiency is that how empty I feel just after workout and how much my hands are shaking under shower while holding my shaker and drink :)
But in general I think BCAA and glutamine are more usefull in endurance sports, where stress and whole body exhaustion is often very high and I could say that weight lifting can't compare in that view. I don't talk about jogging 4 times a week, but serious training, like pro cycling, rowing, triathlon,... After my heaviest gym training my legs have next day strong DOMS, but I was still movable without much problems. After hardest endurance race, I couldn't get of toilet for two days without pulling myself with hand for sink in front of me and walking along walls. Don't imagine getting in/out of bath :D Needs of body and right supplements in situations like that can be very different to those in weight lifting world, so saying something is useless and scam,... It is no secret, that supplement industry exist because of money we gave to it and they want to spend it more and more, but with understanding and knowing what you benefit with some individual supplement can make huge difference for you.
Personally, my evergreen supplements are carbs and whey/casein. Regarding on needs I add BCAA and glutamine, I rarely go for creatine. I always take care for C vitamine (1g+). If needed, I take multivitamins.
When I have too much €/$ I experiment with other supplements...
And tip for all but few exception: next time, instead buying one month supplement stack, go on f**kin' amazon for some books, skip 2 workouts, get your brain in action and read&learn about what are you (want to) using.
BR, Gregor