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Prescription and over-the-counter vitamin K differ by strength and dosage form. The most common form of vitamin K is over-the-counter and is called water soluble chlorophyll. Vitamin K is available in tablet, capsule and liquid forms. Prescription forms of vitamin K are available as injectables and given in cases of extreme need. For example, an injection of vitamin K is often given at birth to help the baby's blood clot. Prescription or over-the-counter vitamin K goes by different names like Mephyton Tablets, Menadione, vitamin K Tablets, Menaphthone, vitamin K1 Tablets, Menaquinone, vitamin K2, Phylloquinone and vitamin K3.
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