Funny you mentioned it,but the half moons on my nails are gone.My thumbs barely show the half moon and almost gone.Most wemen would envy my nails.Me and my wife just looked up nails on wipedia last knight,becaust our hands look like baby hands.The fingernails are clear and pink/color of the skin and strong/could scrape flesh off someones face.Its funny that they say if the half moons are gone under the nail and their clear,that its a sign of poor blood circulation.But you know,it must be the best slow blood circulation in town.Steven West P.S. I knawed my nails to the quick all my life until about 4 yrs. ago.I could not control it.I believe to things about nail biteing now.#1 is parasites under the nail and knawing is like a dog trying to scratch the flea off.#2 is the nail has in them something the body is lacking.These two things,Ill not back down on.I experienced it.Blessings GOOOOO IODINE" CLAP! CLAP! CLAP!