Joint bundling is a subcategory of pure bundling in which the two products are offered together for one bundled price; Leader bundling is a subcategory of pure bundling in which a leader product is offered for discount if purchased with a non-leader product, accessory or other item.
Vitamin B Helps Your Metabolism. You should balance your vitamin supplements to match your needs. A multi-vitamin is great, but if you are extremely fatigued all the time and don't get enough vitamin B in your diet, then adding vitamin B-12 will improve your flagging energy. B-complex vitamins provide you with: 1  Boosted metabolism. 2  Healthy skin.
Updated August 01, 2016. An essential nutrient that keeps your metabolism in check, vitamin B12 is found in many foods, especially animal products. Also available in supplement form, vitamin B12 is involved in regulating metabolism, aiding in the formation of red blood cells, and maintaining the central nervous system. Vitamin B12 is also required for the proper function and development of the brain.