You bet, but you have to make sure you're buying quality stuff.  Shop around.  Also get a lot of your nutrients, if possible, from natural sources like wholesome, organic food!

https://drsircus.com/general/safest-inexpensive-medicines-for-the-world/

This is a very long article, but it is sooooooooooooooo interesting if you're seeking to help yourself rather than paying for medicines that don't help anyway.  It's well worth the time it takes to read it. I made a ton of notes while reading it, too, because there's a lot to remember.