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Vitamin C is one of the few supplements where the formulation genuinely changes the outcome. Pairing ascorbic acid with citrus bioflavonoids — as Thorne does here — reflects how the nutrient appears in whole food, and is the approach our clinicians tend to favour over isolated ascorbic acid alone. Thorne's manufacturing reputation makes this a straightforward recommendation for patients wanting a reliable, daily vitamin C that earns its place on the shelf.
About this product
Vitamin C with Bioflavonoids
Thorne Vitamin C with Bioflavonoids is a daily ascorbic acid supplement formulated alongside citrus bioflavonoids — plant-derived compounds found naturally alongside vitamin C in whole fruit. The pairing matters: bioflavonoids are thought to support the absorption and tissue retention of ascorbic acid, which is why whole-food vitamin C sources have long been preferred over isolated ascorbic acid in clinical practice.
Vitamin C is one of the most studied micronutrients. It contributes to normal immune function, collagen synthesis, and the protection of cells from oxidative stress. It is also involved in iron absorption from plant-based sources — a practical consideration for anyone eating a largely plant-based diet or managing borderline ferritin levels.
This supplement suits a broad range of people: those under sustained physical or mental stress (both deplete tissue vitamin C faster than usual), frequent travellers, individuals in the recovery phase after illness, or anyone whose diet does not reliably include fresh fruit and vegetables. It is also a sensible baseline for those building a supplement stack who want a well-tolerated, bioavailable form of vitamin C before exploring higher-dose protocols.
Thorne is a brand with a longstanding reputation for rigorous manufacturing standards and formulation quality. Their products are regularly chosen by clinicians who need reliable, consistent supplements for patient use. The inclusion of citrus bioflavonoids rather than ascorbic acid alone reflects a considered formulation approach.
What it does
Benefits
- 01
Supports normal immune function during periods of stress
- 02
Contributes to collagen synthesis and connective tissue health
- 03
Citrus bioflavonoids may improve ascorbic acid absorption
- 04
Antioxidant protection against daily oxidative stress
- 05
Aids iron absorption from plant-based food sources
Get the most from it
How to use
Follow the dosage on the packaging. The existing guidance suggests one capsule taken one to three times daily; taking it with food may reduce the likelihood of digestive discomfort, which can occasionally occur with ascorbic acid on an empty stomach.
What's inside
Ingredients
View full ingredient list
Vitamin C, Citrus Bioflavonoids
Common questions
Frequently asked
Why does this contain bioflavonoids alongside vitamin C?
Citrus bioflavonoids are naturally co-occurring compounds in vitamin C-rich fruits. They are thought to support the absorption and tissue retention of ascorbic acid, making this combination closer to how vitamin C appears in whole food than isolated ascorbic acid alone.
Who is most likely to benefit from a daily vitamin C supplement?
People under prolonged physical or psychological stress, those eating a diet low in fresh fruit and vegetables, frequent travellers, and individuals recovering from illness. Those on plant-based diets may also benefit, as vitamin C meaningfully improves non-haem iron absorption.
Can I take this alongside other supplements or medications?
Vitamin C is generally well tolerated alongside most supplements. However, at higher intakes it can interact with certain medications, including some chemotherapy agents and blood thinners. If you are on prescription medication, check with your GP or pharmacist before starting.
How long until I notice a difference?
For immune and antioxidant support, there is no single marker to track without a blood test. Consistent daily intake over several weeks is the typical approach; if you are concerned about deficiency, a plasma vitamin C test can confirm baseline levels before and after supplementation.
Is there anyone who should avoid this supplement?
Those with a history of kidney stones — particularly calcium oxalate stones — should use vitamin C supplements cautiously, as high doses may increase oxalate excretion. Check the packaging for the dose per capsule and discuss with a clinician if you are in this group.
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