I’m 28, and I have never really been a huge vitamin person, but I recently experienced a really bad vitamin b12 deficiency. I started taking b12 and b6 for this reason, but my PCP also recommended taking any daily vitamin with iron.
I highly recommend using labfinder if you want to see where your levels stand before starting any vitamins/supplements. You can choose vitamins/minerals panel and schedule a lab visit – it’s super easy and helpful.