Glutathione vs Vitamin C: Which Antioxidant Do You Need?

Glutathione and vitamin C are partners, not rivals. Vitamin C is the water-soluble antioxidant that patrols your bloodstream; glutathione is the master antioxidant your cells make internally. Vitamin C regenerates used-up glutathione, and glutathione regenerates used-up vitamin C.

What does glutathione do?

Glutathione is a three-amino-acid peptide made in every cell, with the highest concentration in the liver. It neutralises free radicals, supports phase II liver detoxification, recycles other antioxidants, and inhibits tyrosinase — the enzyme that drives melanin production, which is why it is used for skin brightening. Levels fall with age, alcohol, poor sleep, infection and chronic stress.

What does vitamin C do?

Vitamin C is an essential nutrient humans cannot synthesise. It is required for collagen cross-linking, supports white blood cell function, improves non-heme iron absorption, and acts as the first-line antioxidant in plasma. At IV doses it reaches blood concentrations that oral dosing simply cannot achieve.

Why is oral glutathione considered poorly absorbed?

Swallowed glutathione is largely broken down into its component amino acids by gut enzymes before it reaches circulation, so plasma levels move very little. IV administration bypasses digestion entirely and delivers 100% of the dose. Liposomal oral forms perform better than plain capsules but still fall short of IV.

Why does oral vitamin C plateau?

Absorption is saturable: past roughly 200–400 mg in a single dose, the percentage absorbed drops sharply and the excess draws water into the bowel — the classic loose-stool ceiling. IV vitamin C skips the transporters, which is how clinics deliver multi-gram doses comfortably.

Should I take both?

Usually yes. Because they regenerate each other, giving them together keeps both in the reduced (active) state longer than either alone. That is why our beauty and immune drips pair them rather than choosing between them.

Are they safe?

Both have strong safety records at clinical doses. Two real cautions: high-dose IV vitamin C is contraindicated in G6PD deficiency, which we screen for, and anyone with a history of kidney stones should discuss dosing first. Glutathione is well tolerated; occasional patients report mild transient nausea.

Where can I get glutathione or vitamin C IV in Boston?

Both are available at our South Boston clinics as add-ons to any drip, or built into the The Knockout and Defensive Immunity drips on our service menu. Every infusion is given by a licensed nurse under medical supervision — book online here or see full IV therapy pricing.

Full guide: Liposomal glutathione: dosage, absorption, results and side effects.