Mega Dose? Mega Waste: The Vitamin C Trap

Vitamin C is the most abused nutrient on your shelf. You pop gram-level tablets believing you’re boosting immunity, preventing colds, and outrunning fatigue. You’re really flushing most of it down the toilet.

The body tightly controls vitamin C absorption through specific transporters in the gut. At moderate doses-30 to 180 milligrams per day-absorption ranges from 70% to 90%. As the dose climbs past 500 milligrams, absorption falls; above 1,000 milligrams, less than half is absorbed. The excess is oxidized or excreted in urine. You might feel virtuous swallowing 1,000 mg tablets, but pharmacokinetic studies show that 200-400 mg per day saturates plasma levels. Taking 1.25 grams yields only a modest bump that your kidneys quickly eliminate.

More isn’t better; it’s just more. High doses of vitamin C can even lead to gastrointestinal discomfort, kidney stones, and iron overload in susceptible individuals. The supplement industry sells megadoses because they’re profitable, not because your physiology needs them.

Here’s the uncomfortable twist: the very people chasing high doses often neglect real food. Citrus fruits, bell peppers, broccoli, and strawberries provide vitamin C alongside flavonoids, fiber, and enzymes that facilitate absorption. A glass of fresh orange juice delivers usable ascorbic acid and complementary nutrients. Dividing your supplementation into smaller doses spread throughout the day increases efficiency. Eating a variety of fruits and vegetables ensures steady intake without overwhelming your transporters.

Stop using vitamin C as a magic shield. Respect the biology: ingest small, frequent amounts, prioritize whole foods, and let your body decide how much to use. Health isn’t about megadoses; it’s about alignment. Your health isn't mysterious. It's honest.