Kirkman Labs Buffered Vitamin C Powder is a high potency, gentle on the stomach vitamin C that supports immune health and antioxidant protection, built on our trusted Ultra Tested quality. The active ingredient is vitamin C in buffered form for gentler digestion. Kirkman Labs stands for purity, rigorous testing and allergen control worldwide. Safe for sensitive stomachs.

Available Sizes & Variants:

198.5g Buffered Vitamin C Powder – High potency, unflavoured and gentle on the stomach.

Benefits & Features:

• Gentle on the stomach thanks to buffered form.
• High potency vitamin C at 1,100 mg per 1.25 g serving.
• Hypoallergenic and free from gluten, dairy and other common allergens.
• Manufactured under strict cGMP guidelines, with Ultra Tested screening for contaminants.
• Supports immune health, antioxidant protection, and collagen synthesis, while the buffered formula helps higher intakes be gentler on the stomach and easier to tolerate day by day.

From Kirkman Labs, a name known for hypoallergenic science led supplements, this Buffered Vitamin C Powder fits into a careful daily routine. Ultra Tested means it's screened for over 950 potential contaminants and allergens, and Bio-Max formulations are designed for better absorption. The product is made to cGMP standards and is third party tested for quality and purity. It sits well with our broader range, including probiotics, for a balanced, gut friendly health plan. It also pairs nicely with fibre supplements for constipation.

Sodium (from Sodium Ascorbate)
Vitamin C (as Sodium, Magnesium & Potassium Ascorbates, Ascorbic Acid)
Other Ingredients: Xylitol, Silicon Dioxide

• GTIN: 812325021710
• Manufacturer: Kirkman Laboratories
• Categories: Back to School Supplements & EssentialsHealth Supplements for Frequent TravelersHypoallergenic Makeup ProductsImmune System Vitamins & SupplementsKirkmanNew ArrivalsPopular Supplement BrandsVitamin CVitamin C Skincare
• 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.

Take 1/4 teaspoon of the powder 1 to 3 times daily, or follow your healthcare practitioner's instructions. Take 2 capsules daily\, preferably with food.

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

The Active Ingredient Is: Vitamin C (Buffered Ascorbate)

Vitamin C is an handy, essential nutrient and a potent antioxidant. This product delivers vitamin C in a buffered form, combining sodium, potassium and magnesium ascorbates with ascorbic acid to improve tolerability and absorption.

Form and source: the buffered ascorbate mix is designed to support easy digestion and high bioavailability while avoiding typical stomach irritation.

What Does Vitamin C Do?

Vitamin C helps with normal immune function and supports antioxidant protection as described in EFSA-aligned guidance. Dr Hemilä of the University of Helsinki found that supplemental vitamin C can boost immune responses and contribute to overall immune health when taken regularly.

It also contributes to collagen synthesis, which supports skin, bone and joint health through normal physiological processes.

This product is not intended to diagnose, treat, cure, or prevent any disease.

Why Kirkman Labs Buffered Vitamin C Powder is Welzo Selected

We picked Kirkman Labs for its dedication to manufacturing excellence and strict facility standards. Their Ultra Tested® protocols screen for hundreds of contaminants and allergens, reflecting a long-standing emphasis on purity and safety in sensitive formulations. The brand operates under current Good Manufacturing Practices (cGMP) and applies extensive quality controls to protect product integrity, which aligns with our trust in robust, transparent manufacture.

Kirkman Labs also demonstrates product-specific capability with a hypoallergenic, unflavoured vitamin C powder that uses buffered ascorbates to maximise tolerability while maintaining potency. Their Bio-Max Series showcases forms of nutrients designed for high absorption, complementing the needs of individuals with sensitive dietary requirements. This combination of evidence-based formulation and a proven testing framework supports consistent, safe use in complex supplement regimens.

Our team evaluated Kirkman Labs through our standard vetting process, and we trust their commitment to quality. This partnership is reinforced by our team of medical experts and the assurance provided by the standards we enforce.