1. Red Meat Valentin Lupu / 500px / Getty Images Vitamin B12: 2.12 micrograms (mcg) Serving size: 4 ounces Red meats like beef and pork are excellent sources of vitamin B12. Three ounces of 80% lean ...

Despite this, there still will be those who say that we need ‘more research’, but in the meantime, there is little to be lost (vitamin D supplements are inexpensive and have low risk of toxicity) and ...