1 / 4
Thorne Vitamin C Powder is a pure ascorbic acid supplement in powdered form, designed for flexible, daily vitamin C intake.
£25
Thorne Vitamin C Powder is a pure ascorbic acid supplement in powdered form, designed for flexible, daily vitamin C intake.
Thorne Vitamin C Powder is a pure ascorbic acid supplement in powdered form, designed for flexible, daily vitamin C intake. Ascorbic acid is the biologically active form of vitamin C, a water-soluble antioxidant that plays a central role in immune function, collagen synthesis, and the neutralisation of free radicals.
Mix a quarter teaspoon into water or juice and drink promptly. Taking it with food may reduce the chance of gastric discomfort, particularly at higher doses. Follow the dosage guidance on the packaging if you are adjusting the amount.
Thorne Vitamin C Powder is a pure ascorbic acid supplement in powdered form, designed for flexible, daily vitamin C intake. Ascorbic acid is the biologically active form of vitamin C, a water-soluble antioxidant that plays a central role in immune function, collagen synthesis, and the neutralisation of free radicals. It also supports the absorption of non-haem iron, making it a useful companion for those managing low ferritin levels.
The powder format suits people who prefer to avoid capsules, need to adjust their dose incrementally, or want to add vitamin C to a broader morning routine - mixing it into water, juice, or a smoothie takes seconds. It is a practical option for those recovering from illness, under sustained physical or psychological stress (both of which deplete circulating ascorbic acid), or simply seeking a reliable daily top-up when dietary intake is inconsistent.
Thorne is a brand with a long-standing reputation for rigorous manufacturing standards and minimal excipients. This product contains a single active ingredient - ascorbic acid - with no fillers, binders, or flavourings listed, which makes it straightforward to use and easy to stack with other supplements without introducing unnecessary additives. For those whose requirements are confirmed by a blood panel, the dose can be titrated precisely, which a fixed-capsule format does not allow.
Standard UK delivery included on every order, 1 to 3 working days after dispatch.
Next working day for £25 when you order by 12pm. Orders placed before 12pm on a working day leave the same day. Later orders leave the next working day.
You can return unopened and unused items within 30 days of delivery. This does not affect your statutory rights. Read the delivery and returns terms
Your Profile
Your first order creates it. Add your blood results or a wearable, and a doctor can recommend what suits you.
Sign inThe active ingredient — ascorbic acid — is the same. The powder simply allows you to adjust your dose more precisely and avoids the binders or fillers sometimes present in capsule forms. It also dissolves easily into any drink.
Ascorbic acid is generally well tolerated, but doses above bowel tolerance can cause loose stools or gastric discomfort. Starting with a modest amount and increasing gradually helps identify your personal threshold. Those with a history of kidney stones should consult a doctor before supplementing at higher doses.
Vitamin C is commonly taken alongside non-haem iron because ascorbic acid is studied for its role in improving iron absorption. Taking both at the same time is a reasonable approach, but check with your doctor if you are on a prescribed iron therapy.
For general immune and antioxidant support, consistent daily intake over several weeks is typically recommended. If you are supplementing to address a confirmed deficiency, a follow-up blood test after 8–12 weeks is the most reliable way to assess change.
People with a history of kidney stones, haemochromatosis, or glucose-6-phosphate dehydrogenase (G6PD) deficiency should seek medical advice before taking high-dose vitamin C. Check the packaging for allergen information and consult your GP if you are pregnant, breastfeeding, or on medication.
Overall
6 months ago
Been stirring a scoop into my morning orange juice for about three months now. Hard to pinpoint exactly what changed but my energy feels steadier and I haven't had my usual winter cold. Simple, unflavoured, does what it says.
6 months ago
Just ascorbic acid, nothing else. That's exactly what I wanted. Mix it into water before my run and it dissolves quickly with no residue. Happy customer.
6 months ago
I was low on ferritin and my GP suggested pairing vitamin C with my iron supplement. Started using this alongside it and my last blood test showed a proper improvement. The powder format makes it easy to take with food.
6 months ago
No complaints about the quality — dissolves well, no weird taste, and the tub is a decent size. My only gripe is that pure ascorbic acid powder is a commodity ingredient and £24.99 feels steep compared to what you can get from a supermarket brand. Still, the minimal excipients justify it for me, just barely.
7 months ago
Picked this up after a nasty bout of flu left me feeling depleted for weeks. Added it to my smoothie every morning and genuinely felt I was bouncing back faster than usual. Can't prove causation but I'll keep using it.
7 months ago
Swapped from capsules because I wanted to adjust the dose depending on how I'm feeling — higher when stressed or travelling, lower on normal days. The powder format is perfect for that.
Biomarker check, £350MaryleboneSee your vitamin D, iron and B12.At our clinic in Marylebone, London, doctors also offer private blood tests and longevity medicine.
A curated selection of products, tools and rituals, chosen by our doctors.
