If you want a nail varnish that is kind to both nature and yourself, here are some interesting brands to look into.

Suncoat nail polish Suncoat
Varnish from this organic cosmetic manufacturer are water-based, meaning chemical solvents like toluene and acetates are replaced by water so the varnish is environmentally friendly, does not dry or discolour nails and is virtually odour-free.
Tromborg nail polish Tromborg
Ten shades of varnishes filled with bioactive ingredients enriched from organic plant extracts, seawater algae and salt from the Dead Sea. Contains cold pressed Sun Flower Oil that regenerates and keep the nails in good shape, as well as Wheat Germ Oil with high content of Vitamin E and Omega 3 and 6.
Korres nail polish Korres
Free from acetone, phthalates, formaldehyde and toluene but rich in myrrh and oligoelements. The former boosts hydration in the under-the-nail skin area and carries antibacterial properties, the latter is beneficial for dry and brittle nails. © Cover Media