Doppelherz B12 Intense Vita-Energie contains 500 µg of high-dose vitamin B12 in combination with three selected B vitamins and the protein building blocks L-glutamine and L-serine. Vitamin B12, vitamin B6, and niacin contribute to normal energy metabolism, the reduction of tiredness and fatigue, and the normal function of the nervous system. Instructions for use: 1. Close: Turn the cap clockwise past the click: the nutrient chamber containing the powder will open. 2. Shake: Shake the vial well until the nutrient powder is completely dissolved in the liquid. 3. Open: Turn the cap counterclockwise and drink the liquid. Recommended intake: Consume the contents of one vial daily. Notes: The stated recommended daily intake must not be exceeded. Food supplements are not a substitute for a balanced and varied diet and a healthy lifestyle. Keep out of reach of small children. Not suitable for children, adolescents, pregnant women, or breastfeeding mothers.