The third tye of vitamin K, menadione, is not made in nature so is therefore manmade.    From Wordnik.com.  [CreationWiki - Recent changes [en]]

One important exception to these toxicity results involves a synthetic form of vitamin K called menadione.    From Wordnik.com.  [The World's Healthiest Foods] Reference

Food and Drug Administration (FDA) does not allow vitamin K to be sold as a dietary supplement in its menadione form.    From Wordnik.com.  [The World's Healthiest Foods] Reference

While this form of vitamin K can sometimes be converted by the body into non-toxic forms, research studies have shown unwanted risk stemming from intake of menadione.    From Wordnik.com.  [The World's Healthiest Foods] Reference

Yeast cells were treated with either HSF1A, resveratrol (RV), azetidine (AZC), TPCK, TLCK, puromycin (PM), or menadione (MD) at a concentration of 10 µM and for 4 d.    From Wordnik.com.  [PLoS Biology: New Articles] Reference

U.S. patent was issued for menadione topical lotion designed to treat skin rash in patients taking biologic and small molecule epidermal growth factor inhibitors, such as Erbitux ® and.    From Wordnik.com.  [IBTimes.com : Top News] Reference

By a comparison with menadione (which has one hydroxyl group less) it was suggested that plumbagin may prevent NADPH and ascorbate-induced microsomal lipid peroxidation by forming hydroquinones.    From Wordnik.com.  [Find Me A Cure] Reference

These data indicate that treatment with menadione may result in restoration of normal cell turnover rates and prevent skin toxicities that result from inhibition of protein kinases associated with tumor growth signaling pathways, such as the tyrosine kinases MEK, CDK and RAF.    From Wordnik.com.  [News] Reference

EU and Japan USPTO issues Notice of Allowance for menadione to prevent skin rash in patients taking EGFR inhibitors Premier Purchasing Partners announces new agreements for orthopedic power tools and accessories Kaiser Permanente to deploy solar power systems at 15 facilities across the state New cakes and frostings may someday contain less fat and calories.    From Wordnik.com.  [THE MEDICAL NEWS] Reference

(-) or menadione-treated cells, no selectivity was observed.    From Wordnik.com.  [Journal of Biological Chemistry current issue] Reference

(+) cells, whereas ER status had no effect on the rate of menadione-induced damage.    From Wordnik.com.  [Journal of Biological Chemistry current issue] Reference

(+) cells, whereas menadione-induced damage was not dependent on cellular ER status.    From Wordnik.com.  [Journal of Biological Chemistry current issue] Reference

Ingredients: poultry broth, turkey, liver, meat by-products, wheat gluten, corn starch-modified, chicken, soy flour, soy protein concentrate, artificial and natural flavors, salt, calcium phosphate, potassium chloride, taurine, added color, choline chloride, zinc sulfate, thiamine mononitrate, Vitamin E supplement, ferrous sulfate, niacin, copper sulfate, manganese sulfate, calcium pantothenate, Vitamin A supplement, menadione sodium bisulfite complex (source of Vitamin K activity), pyridoxine hydrochloride, riboflavin supplement.    From Wordnik.com.  [Epinions Recent Content for Home] Reference