Whether it is necessary to mainly look at individuals. If you just want to exercise and don't pursue muscle gain and fat loss, then I don't need it at all. Just eat normally. If you want to gain muscle, pursue muscle fitness, have a better body proportion or lose fat, I still recommend you to use sports supplements. People who want to gain muscle need to consume a lot of protein every day. If it is almost impossible to take in food, you must take in a certain amount of protein. Otherwise, the muscle gain speed is too slow to maintain a certain muscle circumference.
In short, it depends on everyone's needs. Anyway, sports supplements are harmless and should be chosen according to your own situation.