Menadione is a man-made form of of Vitamin K (known as K3). http://www.holisticbirds.com/pages/notes0801.htm
Vitamin K and Bone Loss
Vitamin K, found dark leafy greens, egg yolk, and alfalfa, is required to form the bone protein osteocalcin and may also reduce calcium excretion and bone loss. Researchers suspected it might also protect against osteoporosis. As part of the Nurse's Health Study, 12,700 women aged 38 to 63 filled out dietary questionnaires. Diane Feshkanish, M.D., of Harvard Medical School found that women who ate lettuce each day had only 55% the risk of hip fracture as those who ate it once a week.
Reference: American Journal of Clinical Nutrition, January 1999; 69:74-9.
Although naturally derived vitamin K (vitamin K1 and K2) is non-toxic, synthetic vitamin K (vitamin K3) is another story. This form of vitamin K, also called menadione, can build up to toxic levels in the blood. Symptoms of toxicity include hemolytic anemia due to destruction of red blood cells. Some humans experience flushing, sweating, and chest constriction in cases of overdose. An equivalent reaction birds may sensitize the skin and cause some cases of feather picking.
Deficiency of vitamin K can cause bleeding problems, but deficiency is rare in humans and most bird species except when there are problems of malabsorption from the intestines in certain diseases; or when there is an invasion of parasites or yeast; or when antibiotic use has destroyed the population of normal gut flora.
Deficiency can also occur if natural food sources containing vitamin K are not consumed. Alfalfa is an excellent natural supplement for birds.
Menadione is listed as an ingredient on Pretty Bird and Hagens pellets. Zupreem ingredients indicate Vitamin K supplement, so I presume K3. Interesting. My AV's formulated diet of preference is Harrison's but I have a couple of birds that will only eat Zupreem and he has never expressed a concern. Formulated food however only makes up a small portion of my birds total diet.
I doubt that there is a sufficient amount of K3 in any of the quality, reputable pelleted diets to cause toxicity, but at the same time is something to discuss with your avian vet and will depend on the ratio vs. a birds total diet.