Mega-dosing vitamin C is fairly common among alternative medicine practitioners. The medical community recommends an upper limit of 2g per day for adults due to

Mega-dosing vitamin C is fairly common among alternative medicine practitioners. The medical community recommends an upper limit of 2g per day for adults due to mild laxative effects around that dosage. There's a paucity of trials that experiment with dosages above that level, so long term effects are mostly unknown.