Ester-C is a buffered, non acidic vitamin C supplement designed to be easier on the stomach, thanks to its calcium ascorbate complex. Vegetarian capsules and free from eight major allergens make it easy to fit into many lifestyles. Klaire Labs' long standing commitment to professional-grade standards, vegan and non-GMO certification, and allergen-free production offers reassurance that every batch meets purity, potency and safety expectations you can rely on.

Available Sizes & Variants:

100 capsules - convenient daily dose.

Benefits & Features:

• Gentle on the stomach and it digests easily.
• Calcium ascorbate keeps vitamin C easy on the stomach while delivering 500 mg per capsule.
• Vegetarian capsules and free from eight major allergens make it easy to fit into many lifestyles.
• Klaire Labs' long standing commitment to professional-grade standards, vegan and non-GMO certification, and allergen-free production offers reassurance that every batch meets purity, potency and safety expectations you can rely on.
• One capsule delivers 500 mg of vitamin C, making it easy to meet daily needs.

From its calcium ascorbate heritage to vegetarian, allergen-free production, Ester-C stands out in the market. The formula is designed to be easy on stomachs while delivering reliable daily vitamin C. Klaire Labs' professional-grade standards and vegan/non-GMO certifications speak to quality you can trust. In everyday wellness routines, Ester-C pairs well with a vitamin d supplement, vitamin b12 supplements, or probiotics for a balanced approach to health.

(other) Vegetarian capsule (hydroxypropyl methylcellulose, water), stearic acid, microcrystalline cellulose, and silicon dioxide.

• GTIN: 828054002128
• Manufacturer: Klaire Labs
• Categories: CHECKOUT UPSELLKlaire LabsNew ArrivalsPopular Supplement Brands
• 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 one capsule once or twice daily with food, or as advised by your healthcare provider. Take 2 capsules in the morning. For additional support take 2 capsules in the afternoon.

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

The Active Ingredient Is: Vitamin C (Calcium Ascorbate)

Vitamin C, also known as ascorbic acid, is a water soluble nutrient essential for normal physiological functions. In this product it is provided as a buffered calcium ascorbate complex, a gentler, non acidic form designed for broad tolerability.

This formulation combines calcium with ascorbate, delivering a buffered vitamin C complex that is compatible with vegetarian capsules and free from common allergens.

What Does Vitamin C (Calcium Ascorbate) Do?

Vitamin C participates in normal antioxidant processes and supports immune function as part of a balanced diet, in line with EFSA guidance. It also plays a role in connective tissue formation and contributes to normal energy yielding metabolism.

In this buffered form, vitamin C is provided in a manner designed for stomach comfort and compatibility with vegetarian lifestyles, aligning with product goals of quality and tolerability.

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

Klaire Labs, now recognised as SFI Health, brings a heritage of professional‑grade quality and industry standing that makes it a natural Welzo partner. Their reputation for rigorous formulation and emphasis on purity aligns with our commitment to trustworthy, science‑driven supplementation.

This brand’s Ester-C formulation demonstrates product‑specific capability through a buffered calcium ascorbate complex, designed to be gentler on the stomach and free from common allergens. Their approach includes non‑GMO and Vegan certification and avoidance of eight major allergens, with formulations manufactured to meet stringent purity and potency requirements. This dual emphasis on comfort and clean ingredients supports reliability in everyday use, which is essential for Welzo shoppers seeking quality guarantees and predictable results.

Our trust stems from Welzo’s vetting process and from highlighting Klaire Labs’ established manufacturing standards. This brand was evaluated by our medical team for alignment with our supplement quality standards, ensuring a fabric of safety, transparency and consistency that underpins the product fit for this supplement category.