Magnesium vs. Vitamin C: Which Is Better for Immunity and Energy?

Key Takeaways Magnesium helps support energy production by activating ATP. When your energy is low or you’re getting sick more often, magnesium and vitamin C are two supplements you might consider. Vitamin C Supports Energy IndirectlyVitamin C does not directly create energy. Low vitamin C levels have been associated with fatigue and reduced physical work capacity, likely due to impaired metabolism and increased oxidative stress. High doses of vitamin C may cause gastrointestinal discomfort and, in some people, increase the risk of kidney stones.