As your body becomes more efficient at processing fuel, it may help increase your energy levels
Wilson C, Muoz-Palma E, Gonzlez-Billault C (2017) From birth to death: a role for reactive oxygen species in neuronal development
I think its going to be both/and.
The containers were sealed and left at 4C in the dark
Package Quantity: Benefits: Main Ingredients: Direction for Use: Ingredient list - Refined Dextrose, Microcrystalline Cellulose, Niacinamide, L-Glutathione Yeast Extract, Hydroxypropyl methylcellulose, CMC-Ca, Silicon Dioxide, Magnesium Stearate, Mixture(Calcium Carbonate, Modified Starch), Stearic Acid, Glycerin Fatty Acid Ester, Vitamin B2, Vitamin B6 hydrochloride, Vitamin D3 mixture[Arab Gum, Sucrose, Corn Starch, Processed Oil and Fat(Palm Oil), Silicon Dioxide, Vitamin D3, Vitamin E], Vitamin E mixture(dl--tocopheryl acetate, Modified Starch, Glucose Syrup Powder, Silicon Dioxide), Zinc Oxide, Selenium in Dried Yeast Loading related products...
In the winter, when were already prone to feeling tired and run down, maintaining healthy B12 levels can ensure that your body has the oxygen it needs to function properly and stay energized