There is a lot of research into delivering drugs through nails, but I think this is through the ends of the nails, rather than the tops. I doubt nail varnish has much effect.
Why don’t you try using varnish on one foot all winter and see if there is a difference between the nails on each feet?
I think it weakens your nails not strengthen them, probably something to do with your nails already thinking they are thick enough so don’t produce more. I don’t think it’s going to let nasty chemicals though though. I don’t like the feel of nail varnish on my nails because it does feel like my pores are clogged up.
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