
	3D Medical Animations Close This information is provided by an independent source. Merck & Co. does not endorse and is not responsible for the accuracy of the content, or for the practices or standards of non-Merck sources. This information provided is not intended to be a substitute for professional medical advice. A licensed healthcare professional should be consulted for diagnosis and treatment of any and all medical conditions. The manufacturer of a product generally has the most complete information about that product. How to use How to use The world's largest library of 3D medical animations developed and copyrighted by Blausen Medical Communications. The Human Atlas figures rotating model, labeled slides, and printable text in addition to animated videos. Shows a video of the selected health topic. Controls play, pause, and restart of the video. Shows a summary of the selected health topic. Controls to scroll the text. Shows a 3 D model of the video. Controls to rotate the model. Shows slides from the video. Controls to change slides.

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This information is provided by an independent source. Merck & Co., Inc. is not responsible for this content. Please discuss any and all treatment options with your healthcare professional. The manufacturer of a product generally has the most complete information about that product.

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vitamin B₁₂ cyanocobalamin, a member of the vitamin B complex that contains cobalt and is needed for the efficient production of red blood cells and for the health of the nervous system; its activity is associated with that of another B vitamin, folic acid. Inability to absorb vitamin B₁₂ occurs in pernicious anemia and sprue. Vitamin B₁₂ is not found in plant foods; the main sources in the human diet are animal products such as milk, eggs, and liver. Probably the ultimate source of B₁₂ is bacterial production in animal intestines; this occurs in humans, and normally meets most of the body's requirements

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