I have about 8 plus just placed an order for a few more. Most are immunity builders like vitamin c or zinc I started buying due to covid.
I buy mostly from an online health and wellness shop and every week the founder sends a newsletter of their hero products. I love the way she writes, I find it compelling so I always get sucked in! I didn’t realise I needed hibiscus powder & salt pipes in my life! 
About 70% of my meals are healthy & nutritious and on average I eat about 8 veg and fruit a day. I don’t need all these extra vitamins then do I?