The Label
Vitamin C — 20 mg
The one nutrient collagen genuinely cannot be built without. Here is what it is, what it does, and what our figure means.
What Vitamin C Is
Vitamin C is ascorbic acid, and human beings are among the small number of mammals that cannot make it. Most animals synthesise their own in the liver from glucose; somewhere in our evolutionary past the final enzyme in that chain broke, and every milligram you have ever used came in through your mouth.
Of everything on our panel, this is the nutrient whose role in skin is least negotiable. It is not a support ingredient. It is a required cofactor for a reaction your body cannot route around.
What It Does
In collagen
A fresh collagen strand is useless until two enzymes — prolyl hydroxylase and lysyl hydroxylase — modify specific amino acids along its length. Only then can three strands wind together into the stable triple helix that gives collagen its tensile strength. Both enzymes depend on ascorbate to keep their iron in the right state. Without it they stall, and the collagen that results is weak and unravels.
In protecting vitamin E
When vitamin E absorbs an oxidation reaction inside a cell membrane it is itself left in a spent state. Vitamin C, sitting in the watery compartment beside the membrane, hands it an electron and puts it back to work. This is the reason the two nutrients belong on a panel together rather than separately.
In iron absorption
Ascorbate substantially improves absorption of the non-haem iron found in plant foods. That matters for hair more than most people realise, because iron status is one of the genuinely established nutritional influences on hair shedding.
Our Amount
20 mg In Every Serving
Our serving carries 20 mg. That is a supporting amount rather than a therapeutic dose — adult requirements sit around 75 to 90 mg a day and are usually met by diet without difficulty. Its job here is to make sure the collagen enzymes and the vitamin E recycling loop are covered as part of the daily panel.
Two enzymes have to modify a fresh collagen strand before three of them can wind together into the stable triple helix that gives collagen its strength, and both enzymes stall without vitamin C to keep them running. Your body makes your collagen. This is one of the things it cannot make it without.
When People Fall Short
Severe deficiency is scurvy, which was killing sailors long before anyone knew why, and its early signs are almost entirely a collagen story: bleeding gums, easy bruising, wounds that reopen, corkscrew-shaped body hairs and small red spots around hair follicles. Every one of those is the visible consequence of connective tissue built without functioning hydroxylase enzymes.
Frank scurvy is rare in developed countries. Marginal status is not, particularly in smokers, who metabolise vitamin C faster, and in people eating very little fresh produce.
Where It Occurs In Food
| Source | Roughly | Notes |
|---|---|---|
| Red bell pepper | About 95 mg per half cup | More per gram than an orange |
| Orange | About 70 mg each | The one everybody thinks of |
| Kiwi fruit | About 64 mg each | Small, dense, easy |
| Broccoli | About 51 mg per half cup cooked | Lost quickly to boiling water |
| Strawberries | About 49 mg per half cup | Best raw |
| Brussels sprouts | About 48 mg per half cup | Steam rather than boil |
The Ceiling, And The Cautions
The adult upper limit is 2000 mg a day, and our 20 mg sits nowhere near it. Exceeding the limit is uncomfortable rather than dangerous for most people: diarrhoea and stomach cramps are the usual result.
Two groups should be more careful. People prone to calcium oxalate kidney stones may increase their risk at high doses, and people with haemochromatosis should be cautious because vitamin C increases iron absorption.
Answers
Vitamin C Questions
The questions we are asked about this nutrient specifically.
Is 20 mg enough to matter?
It covers the cofactor role, which is what a panel like this is for. If your diet contains fruit and vegetables you are almost certainly meeting the full requirement already, and this is a floor rather than a dose.
Should I take vitamin C with collagen powder?
If you take collagen powder, then yes, because the amino acids are useless to your body without the enzymes that assemble them, and those enzymes need ascorbate. It is also the reason we chose vitamin C over collagen in the first place.
Does vitamin C fade dark spots?
Topical vitamin C has some evidence for that at the right concentration and pH. Swallowed vitamin C is doing a different job, and we would not claim the two are interchangeable.
Does it help with iron and hair loss?
It improves absorption of plant-source iron, and iron status genuinely does influence shedding. If you suspect low iron, ask for a ferritin test rather than guessing.