★★★★★
Niacin is used by the body to synthesize NAD which in turn is used to synthesize ATP the main cellular energy storage/carrier. Deficiency of niacin can also manifest as pellagra.
A couple of years ago, I started to feel tired all the time. After reading books by Dr. Brownstein on the importance of salt (not table salt but Celtic or Himalayan) and iodine, I started taking a tablespoon of sole (salt water solution) first thing in am with 8 oz of water and iodine. This probably gave me back 80% of my lost energy. After I started supplementing with 250 mg of niacin (not the flush free version) my energy was totally back. I recommend reading "niacin the real story". Niacin and iodine are probably the 2 most powerful and effective supplements you can take for energy and hormonal functioning.
The power of niacin is quite miraculous and can cure arthritis (niacinamide 1500 mg 2x a day with 1000 mg vit c) depression, schizophrenia, addiction, high cholesterol etc.