Vitamins B and C are essential for energy production and weight loss. Vitamin B helps the body metabolize carbohydrates, fats, and proteins to make ATP (cellular energy). It also plays a role in producing serotonin, norepinephrine and dopamine – hormones that drive motivation and mood. Vitamin C is important for collagen synthesis, which supports healthy skin, muscle, bones and joints as well as aids in digestion. Both vitamins can help you maintain energy levels while on your weight-loss journey.