If you are low in them yes they can especially B-vitamins, the liquid sublingual form especially quick.

I think so. I take a lot of them. They help with depression too.

Eat well, shouldn't need them, up for debate whether they work or not for energy as you buy them over the counter, absorption is problematic. Get checked out by your doctor if you feel you need them.

I was taking whole food suppliments but they gave me additional problems, so I stopped and feeling better now.

Not necessarily. It depends on the vitamins and your overall health needs

Naw ..just eat lots of fruit vegetable nuts and berries 👍

if you're deficient they can, but it's rare

Mine do for me, but I don’t think it’s universal.

Yep