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I'm always on the lookout for foods rich in vitamin K2 MK-4, because it's so important and so rare in the modern food system. I heard some internet rumors that marrow might be rich in fat-soluble vitamins. Google let me down, so I decided to look through the rat studies on K2 MK-4 in which they looked at its tissue distribution. I found one that looked at the K2 MK-4 content in different tissues of rats fed vitamin K1. Marrow was rich in K2, along with testes. It contains 10-20 times more MK-4 than liver by weight, and more than any of the other organs they tested (serum, liver, spleen, kidney, heart, testes, marrow, brain) except testes. They didn't include values for salivary gland and pancreas, the two richest sources.

Aplastic Anemia is a rare but serious disease of the blood cells. It is diagnosed by the inability of the bone marrow to synthesize RBCs, WBCs and platelets. The spongy bone marrow contains stem cells that are actively involved in Hematopoiesis.

White button mushroom enhances maturation of bone marrow-derived dendritic cells and their antigen presenting function in mice.\nRen Z, Guo Z, Meydani SN, Wu D.\nJ Nutr. 2008 Mar;138(3):544-50.\nPMID: 18287364

Vitamin D A Key Player In Overall Health Of Several Body Organs, Says Biochemist In a paper published in the August issue of the American Journal of Clinical Nutrition, Norman identifies vitamin D's potential for contributions to good health in the adaptive and innate immune systems, the secretion and regulation of insulin by the pancreas, the heart and blood pressure regulation, muscle strength and brain activity. In addition, access to adequate amounts of vitamin D is believed to be beneficial towards reducing the risk of cancer. Norman also lists 36 organ tissues in the body whose cells respond biologically to vitamin D. The list includes bone marrow, breast, colon, intestine, kidney, lung, prostate, retina, skin, stomach and the uterus.

Derived from the cap and stem of the mushroom. The active constituent is thought to be a beta-glucan polysaccharide. The whole mushroom is used primarily as a dietary element, but extracts and supplements are sold as immune stimulants for patients with HIV or cancer. While no adverse effects have been reported, some studies reveal a hypoglycemic effect following administration of maitake extract (9) (12). Maitake was shown to enhance bone marrow colony formation, reduce doxorubicin toxicity in vitro (11), and to inhibit tumor metastasis