The “fastest” approach must still be safe and sustainable. Start with food: seeds (pumpkin, chia), nuts, legumes, whole grains, and leafy greens can rapidly improve daily intake. Next, address barriers—ongoing diarrhea, malabsorption issues, or heavy alcohol use can prevent improvement through diet alone. If supplements are needed, better-dissolving forms (citrate/chloride/lactate; and in practice, glycinate) may be absorbed more effectively, but increasing the dose “for speed” often triggers diarrhea and backfires. People with kidney disease should avoid rapid, uncontrolled dosing. Clinically, a controlled 2–4 week plan that considers symptoms and underlying causes is usually the safest way forward.