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.
You can also tell the difference between copper-nickel and 40% silver Bicentennial half dollars by weighing them: A clad Bicentennial half dollar weighs about 11.34 grams. A 40% silver 1976 half dollar weighs 11.5 grams. If you have a copper-nickel clad 1976-S Bicentennial half dollar, itâs probably a collectible proof coin and is worth about $1.