Human studies have mainly described pharmacokinetics, safety, and tolerability, rather than demonstrating strong clinical effectiveness
If your diet does not provide B12 vitamins at all typical of those on a vegetarian or vegan diet you may need to take B12 tablets for the rest of your life
When a person exercises, the heart pumps faster to provide oxygen to the muscles, and vigorous/strenuous exercise, especially, can sometimes trigger heart palpitations, which is a good reason to get a doctors approval before starting an exercise program
In addition, products from such vendors may contain impurities or harmful chemicals, increasing the risk of adverse effects
Same name, unrelated chemistry, different aisle
This colour serves as a freshness indicator - shifts toward brown or green suggest oxidation and degradation