Magnesium gluconate is commonly found in supplement form and available over the counter at pharmacies, health food stores, and online retailers. These supplements typically come in tablets or capsules, with varying dosages. 

Some multivitamins and mineral supplements may contain magnesium gluconate as part of their ingredient list. It’s essential to read labels carefully and choose reputable brands to ensure product quality and purity. Despite not being found in significant quantities in food sources, magnesium gluconate is typical as a supplement. Therefore, supplementation is often necessary to meet daily magnesium requirements.