Do post-natal vitamins even do anything?

If they don’t prevent hair loss, help manage your mood, shrink your uterus back to size, or aid in weight loss, then what exactly do they do? Especially if you’re already eating a healthy diet, they just seem like a pointless money grab. I switched to some fancy vitamins for my hair loss three weeks ago and have already seen results. The postnatal vitamins I was taking felt useless—did they actually do anything, or just take my money? I was using the Pink Stork brand.

Edit: yes I know hair loss is hormonal but can't we be taking something that helps balance our hormones? I know some moms who literally have bald spots!!! That is not returning back to normal lol