system
Given the following post, respond as if you're commenting on Reddit:
human
Do hair and nail supplements actually work?

My aunt is asking for recommendations and I had a google search asking if they actually work, and the results showed that they *may* increase nail thickness but unless you’re not well nourished, they won’t make much difference. But I’m hoping someone from this community might be able to share some information or sources? Aside from my aunt looking for recommendations, this has been something I’ve wondered about before. Thanks for any help (:
gpt
If you look at the ingredients it is just vitamins, and if you eat a balanced diet you already have all the vitamins you need, so excess is just removed in your urine. 

They technically work if you are malnourished, as they would contain the vitamins and minerals needed for hair and nail growth, but they are just placebo for normal healthy people.