creatine you only take 4 x 5g when in your loading phase which lasts a week, then it’s 3g for maint or just 3g a day for maint which will get you to saturation anyway but takes about 3-4 weeks
https://creatine.wiki/w/Creatine_Usage/Creatine_for_Beginners#content-recommended-dosage
fish oil good for you
the others I’m not gonna touch
Why?
It’s science bro, if it helps improve your life why wouldn’t you do it?