Ester-C Bio, 100 Capsules - Klaire Labs

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

United Kingdom & Rest of the World Shipping Details:
Same day dispatch for orders placed by 2pm (Orders after 2pm dispatched 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 14 days in the same original and unopened packaging. Subject to T&C's.

Welzo is a UK-based health platform. Orders ship from the UK.

Take one capsule once or twice daily with food, or follow your healthcare professional's advice. Take 1 lozenge daily or as directed by your healthcare professional\, lozenge may be broken into smaller pieces if lower dosage is desired.
Do not take within 5 hours of bedtime as it may interfere with sleep.

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

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

Vitamin C, in the Ester-C form as calcium L-ascorbate, is a water-soluble nutrient essential for normal connective tissue health and immune function. This non-acidic, buffered form is designed to minimise gastrointestinal discomfort while delivering antioxidant support alongside plant-derived bioflavonoids.

This formulation combines Ester-C calcium L-ascorbate with a Citrus bioflavonoid complex, rutin and Pycnogenol®, which together help stabilise capillaries and support antioxidant activity and recycling of vitamin C.

What Does Vitamin C Do?

Vitamin C participates in normal collagen synthesis and supports capillary strength, connective tissue structure and immune system function. The accompanying bioflavonoids contribute to antioxidant protection and may enhance vitamin C absorption and recycling. The NHS and EFSA recognise vitamin C as supporting these normal physiological functions.

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

Klaire Labs is our chosen brand for Ester-C Bio because this professional‑grade maker brings a long-standing reputation for purity, rigorous quality standards, and transparent sourcing. This brand is widely recognised in the healthcare community for its focus on hypoallergenic formulations and strict quality control, making Klaire Labs a trusted partner for sensitive and choosy consumers. The brand’s commitment to high‑grade ingredients and clear labelling aligns with Welzo’s standards for safety and reliability. For us, Klaire Labs’ well‑established practice of operating with strict purity and potency protocols underpins why we stock this brand in our UK catalogue, supported by Welzo's medical team for compliance with our ingredient quality and purity standards. Welzo's healthcare professionals and our ingredient quality and purity standards inform our evaluation, reinforcing Klaire Labs as a trusted supplier.

In terms of product fit, Ester-C Bio leans on branded ingredients such as Ester-C® and Pycnogenol®, with a formulation built to support capillary strength and immune function as described in the brand materials. This makes Klaire Labs especially suited to delivering a well‑characterised, specialist vitamin C supplement for the British market, where clarity of ingredients and manufacturing transparency are highly valued. Our product selection process emphasises thorough vetting by Welzo's expert team to ensure we maintain high standards for both brand and formulation.