Vitamin C
Vitamin C in tablets, capsules, powder and liposomal drops, plus buffered forms and combinations with zinc. We explain which form suits you, why more than 1,000 mg rarely adds much, and how to take it daily.Read more →
Filters
Availability
Brand
Form
Diet
Goal
Price
Vitamin C forms, dosage and daily use
What vitamin C is and what it does
Vitamin C, also called ascorbic acid, dissolves in water. Your body cannot make it and stores only small amounts, so a regular daily intake matters more than one large dose. The European food safety authority (EFSA) has approved several statements for it. Vitamin C contributes to the normal function of the immune system, to the protection of cells from oxidative stress, to normal collagen formation for the normal function of skin, gums, teeth and blood vessels, and to the reduction of tiredness and fatigue. It also increases iron absorption. You will find it on its own and in combinations across our full vitamin range.
The forms differ more than the label suggests
Plain ascorbic acid is the best-studied form and the cheapest per gram. It is also acidic, which some people notice on an empty stomach. Buffered forms such as calcium ascorbate or sodium ascorbate are bound to a mineral, so they taste and feel milder. Liposomal vitamin C is wrapped in a tiny fat layer, so more of it passes through digestion intact. It costs more per gram, and it suits you if you want a higher intake without stomach complaints. Powder lets you dose freely and mix it into water. Tablets of 1,000 mg are practical, but usually need pressing agents. Gummies carry the lowest dose per piece and often contain sugar or sweeteners.
How we choose the vitamin C we stock
We judge every vitamin C product on three points: the form, the dose per serving, and whether the combination makes sense. We keep plain ascorbic acid because it is well researched and good value, buffered ascorbates for sensitive stomachs, and liposomal versions where the higher price buys better absorption. We stock pairings with zinc because both have their own approved role in immune function, and we skip blends where the extra ingredients sit far below any useful amount. We only carry brands we stand behind, and every product passes our compliance team before it goes live. You can read how we select brands and products.
Who it suits, and what to expect
Most people in the UK get enough vitamin C from food. A supplement is more relevant if you eat little fruit and vegetables, if you smoke, or if your intake dips in winter. Many shoppers on this page are building a simple daily base, often alongside a zinc supplement or the products in our IMMUNITY + VITALITY pillar.
Two practical points are worth knowing. First, absorption drops as the dose rises: your body takes up a far higher share of 250 mg than of 1,000 mg at once. If you want a higher daily intake, split it across two moments rather than taking one big tablet. Second, vitamin C is not a quick fix. It supports functions that run every day, so consistent use over weeks is what counts, not a single dose when you already feel unwell. If a high dose causes loose stools or stomach discomfort, that is usually a sign to lower the amount or switch to a buffered form.
Frequently asked questions
What is vitamin C and why do people take a supplement?
Vitamin C, or ascorbic acid, is a water-soluble vitamin. Your body cannot produce it and keeps only small reserves, so you need it from food or a supplement each day. Fruit and vegetables are the main dietary sources. People choose a supplement when their diet is low in fresh produce, when they smoke, or simply to keep a steady daily base. Approved statements include a contribution to the normal function of the immune system and to the reduction of tiredness and fatigue.
How much vitamin C do I need each day?
In the UK, the NHS puts the reference intake for adults aged 19 to 64 at 40 mg a day. European reference intakes are higher, because they aim to keep body stores fuller rather than only to avoid deficiency.
| Group | EFSA reference intake |
|---|---|
| Men, 18 and over | 110 mg |
| Women, 18 and over | 95 mg |
| Pregnancy | 105 mg |
| Breastfeeding | 155 mg |
Source: EFSA
Which form of vitamin C should I choose?
It depends on your budget, your stomach and how you prefer to take things.
| Form | Character | Best suited for |
|---|---|---|
| Ascorbic acid | Best studied, low cost, acidic | Everyday use |
| Buffered ascorbate | Mineral-bound, mild | Sensitive stomachs |
| Liposomal | Fat layer, better absorbed, pricier | Higher daily intake |
| Powder | Flexible dosing, few additives | Splitting doses |
| Gummies | Low dose, added sugars | People who dislike pills |
When is the best time to take vitamin C?
Any fixed moment works, because the goal is a steady daily intake rather than perfect timing. With food is often more comfortable, since plain ascorbic acid can feel sharp on an empty stomach. If you take more than about 500 mg a day, split it into two smaller servings, morning and evening. Your body absorbs a larger share of small amounts, so two servings usually deliver more than one big tablet.
Can you take too much vitamin C?
Yes. Vitamin C is water-soluble, so surplus leaves the body in urine, but high intakes can still cause stomach pain, wind and loose stools. The NHS advises not to take more than 1,000 mg a day from supplements. Many high-strength tablets sit exactly at that level, so check your total across all products, including multivitamins and effervescent drinks. If you notice digestive discomfort, lower the dose or move to a buffered form.
Does vitamin C really improve iron absorption?
Yes, this is one of the approved statements: vitamin C increases iron absorption. It mainly helps with non-haem iron, the type found in plants, beans and most supplements. That is why vitamin C is often taken in the same moment as an iron supplement or with a plant-based meal. Around 50 to 100 mg alongside the meal is enough; a very high dose adds little extra here.
Is liposomal vitamin C worth the higher price?
Liposomal means the vitamin sits inside a tiny fat layer, so more of it survives digestion and less is lost. That matters most if you want a higher daily intake, or if plain ascorbic acid upsets your stomach. For a simple daily 200 to 500 mg, a buffered powder or capsule usually does the job for far less per gram. So the honest answer is: pay for liposomal when absorption is your bottleneck, not by default.
Is vitamin C from rosehip or acerola better than ascorbic acid?
Chemically, the vitamin C molecule is identical, whichever source it comes from, and your body treats it the same way. Rosehip and acerola extracts do bring other plant compounds such as bioflavonoids, which is why some people prefer them. Note that many products list a high total figure while most of the vitamin C still comes from added ascorbic acid, with only a small share from the fruit extract. Read the label for the actual amounts per serving.
How long before vitamin C has an effect?
Vitamin C is not something you feel working. It supports functions that run continuously, so the useful measure is consistency rather than a noticeable moment. If your intake was low, body stores fill up over roughly two to three weeks of daily use. That is the timescale to plan for. Taking one large dose once symptoms appear does not make up for weeks of low intake, so a modest daily amount is the more sensible approach.
