L-抗坏血酸

What is L-Ascorbic Acid?

L-ascorbic acid is the biologically active form of vitamin C — the form that the human body can actually absorb and utilise. While 'vitamin C' is often used as a general term for compounds with vitamin C activity, L-ascorbic acid is the specific chemical entity that corresponds to true vitamin C. It is a water-soluble, sugar-like compound with powerful reducing (antioxidant) properties. Most mammals can synthesise vitamin C from glucose, but humans lack the final enzyme in this pathway (L-gulonolactone oxidase), making dietary or supplemental intake essential.

L-ascorbic acid is the most extensively studied form of vitamin C, with decades of research supporting its absorption, metabolism, and biological functions. It is the form found naturally in fruits and vegetables, most famously in citrus fruits, but also in bell peppers, kiwi fruit, broccoli, and strawberries. In supplements, L-ascorbic acid is valued for its purity — it contains only vitamin C, without the additional compounds present in esterified or mineral-bound forms. This makes it the preferred form for high-dose supplementation where the goal is maximum vitamin C delivery with minimal additional ingredients.

EFSA-approved health benefits

The European Food Safety Authority (EFSA) has confirmed that L-ascorbic acid (vitamin C):

• contributes to normal collagen formation for the normal function of skin, bones, cartilage, gums and teeth
• contributes to the normal function of the immune system
• contributes to normal energy-yielding metabolism
• contributes to the protection of cells from oxidative stress
• contributes to the reduction of tiredness and fatigue
• contributes to the normal functioning of the nervous system
• increases iron absorption
• contributes to the regeneration of the reduced form of vitamin E

Why we use L-Ascorbic Acid in Nutri-Leaf formulas

Nutri-Leaf Vitamin C 1000mg contains exactly two ingredients: 1000mg of pure L-ascorbic acid and a plant-based HPMC capsule shell. No fillers, no flow agents, no preservatives, and no magnesium stearate. This two-ingredient approach is the ultimate expression of our transparency principle — what you see on the label is what you get in the capsule. L-ascorbic acid is the pure vitamin C form with the strongest evidence base for bioavailability and efficacy. It is the form we choose because it is the form science trusts.

Products containing L-Ascorbic Acid

The Nutri-Leaf product featuring L-ascorbic acid is Vitamin C 1000mg, a pure two-ingredient formula providing 1250% NRV per daily capsule. L-ascorbic acid from rose hip also features in Immune Complex alongside zinc, selenium, echinacea, and ginger for comprehensive immune support.

Explore how pure L-ascorbic acid contributes to multiple aspects of health on our Immune Support, Beauty from Within, and Energy & Vitality health guides. Visit the Ingredient Philosophy page for more on our minimal-ingredient approach.

Food supplements are not a substitute for a balanced and varied diet and a healthy lifestyle.