I wouldn't use any supplement that wasn't FDA approved or USP certified. Most of those ads on social media are AI generated and severely unregulated. I think you're more likely than not to be scammed by them.

I’m seeing ads on social media for adhesive patches that deliver iron through your skin.
My adult daughter has spent years supplementing with pills or liquid- both which have challenging side effects - constipation and upset tummy primarily.
Wondering if anyone has used these patches?