By Dr. Mercola. Vitamin B12 is fittingly known as the energy vitamin, and your body requires it for a number of vital functions. Among them: energy production, blood formation, DNA synthesis, and myelin formation. Myelin is insulation that protects your nerve endings and allows them to communicate with one another.
Values for most Kennedy half dollars are cheap, except for the prices of couple scarce coins and error coins, of which there many. 1  The 1970-D Kennedy half dollar is the scarcest, worth about $20 in typical uncirculated grades. 2  The 1998-S silver matte finish Kennedy half dollar is worth $500.
Selling Kennedy Half Dollars Since 1973. The 1964 Kennedy 90% silver half dollars have been held in esteem since they were introduced. The coins carry the image of a popular president who had been assassinated only a few years before their release, and 1964 Kennedy half dollars were the last 90% half dollar coins minted.