Buffered C Powder supports immune function and antioxidant protection, thanks to high-strength vitamin C bound to minerals for easier digestion. Key actives include L-ascorbate vitamin C along with calcium, magnesium and potassium bound to ascorbate for better tolerance and daily resilience. Thorne is known for clean, transparent sourcing and strict quality; this product is made in a cGMP facility and NSF Certified for Sport.

Available Sizes & Variants:

8.15 oz Buffered C Powder - convenient daily dose for immune support and antioxidant protection.

Benefits & Features:

• Supports immune health with high potency vitamin C bound to minerals.
• Gentle on the stomach.
• Provides essential minerals (calcium, magnesium, potassium) to support bones, muscles and balance.
• Intended for daily use as part of a balanced wellness routine.
• NSF Certified for Sport and produced in a cGMP facility, Thorne's quality controls mean you get high purity, rigorous testing, and confidence in every scoop.

Thorne's Buffered C Powder is built on a commitment to purity and potency. The formula uses 100% reduced and buffered L-ascorbate, with minerals bound to ascorbate for gentler digestion, and it’s triple recrystallized under nitrogen for max purity. Manufactured in a cGMP facility and NSF Certified for Sport, it reflects Thorne’s long-standing focus on rigorous testing and transparency. If you’re balancing a daily wellness routine that includes magnesium glycinate or a vitamin d supplement, Buffered C Powder slots in smoothly, alongside betaine hcl for digestion comfort.

Vitamin C (as Ascorbic Acid), Calcium (as Ascorbate reacted from Calcium Carbonate and Ascorbic Acid), Magnesium (as Ascorbate reacted from Magnesium Carbonate and Ascorbic Acid), Potassium (as Ascorbate reacted from Potassium Bicarbonate and Ascorbic Acid)

• GTIN: 693749155027
• Manufacturer: Thorne
• Categories: New ArrivalsPopular Supplement BrandsThorne Supplements
• Best buy: 6 - 24 months+

United Kingdom Shipping:

Orders placed by 2pm (Monday to Friday) are dispatched the same day. Orders placed after 2pm will be dispatched the next working day.

Free shipping on orders over £50 to the UK.

Returns: Our products are meant to make you feel healthy and at your best. If you need to return your item, you can do so free of charge within 30 days in the same original and unopened packaging. Subject to T&C's.

Dissolve one level scoop in 8 ounces of water and drink once or twice daily, or follow your health professional's advice. Take 1 capsule daily or as recommended by your health professional.

Please consult the product packaging for accurate instructions on how to use the product.

The Active Ingredient Is: Vitamin C (L-ascorbate)

Vitamin C, or what you might call L-ascorbate, is a water-soluble nutrient involved in normal physiological functions and a key antioxidant role in the body.

This formulation uses buffered L-ascorbate bound to calcium, magnesium and potassium to improve GI tolerance and keep vitamin C potent while supporting mineral balance.

What Does Vitamin C Do?

Vitamin C helps with antioxidant protection and supports immune system function in line with NHS and EFSA guidance.

It also aids collagen formation which backs skin, cartilage and vascular health in line with EFSA and NHS guidance.

This product isn't meant to diagnose, treat, cure, or prevent any disease.

Welzo picks brands that show rigorous quality, clear provenance and a proven ability to deliver trustworthy, consumer-facing science. This brand meets our standards through a clear commitment to purity, transparent sourcing, and clinically informed product design, which makes Thorne a natural fit for our Buffered C Powder selection.

Thorne is recognised for making products in a cGMP-certified facility and for third-party verification that backs safety and quality. The brand’s commitment to clean ingredients, triple recrystallisation to maximise purity, and a focus on rigorous clinical research line up with our expectation that partners deliver consistent, well-tested vitamins. This is reinforced by NSF Certification for Sport®, underscoring independent testing for purity and contaminants that resonates with athletes and health-conscious customers alike. Welzo’s team evaluates such certifications and manufacturing standards as part of our our rigorous testing protocols framework, ensuring robust quality control from source to shelf.

We picked Thorne over competitors because of their solid reputation for quality manufacturing, transparency, and a science-led approach to supplement design, making them an ideal partner for this vitamin C formulation. This brand’s production know-how and safety credentials sit well with our internal team and UK regulatory expectations, boosting our confidence in their local market readiness and ongoing compliance. For insights from Welzo’s clinical evaluation team, see Welzo's healthcare professionals.