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Vitamin C is one of the most effective antioxidant ingredients used in skincare. Think of antioxidants as your skin's "bodyguards" – they help protect your skin from everyday damage caused by pollution, UV exposure, and environmental stress. While Vitamin C won't replace sunscreen, it works alongside your SPF to provide additional protection against premature ageing.

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As we age, our natural Vitamin C levels in the skin decline. This can contribute to dullness, uneven skin tone, slower healing, fine lines, and loss of firmness. Applying Vitamin C topically helps replenish these levels and supports healthier, brighter skin.

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What are the benefits of Vitamin C?

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With consistent use, Vitamin C can help to:

• Brighten dull, tired-looking skin

• Improve overall skin radiance and "glow"

• Fade post-inflammatory pigmentation (marks left after spots)

• Reduce the appearance of sun damage and uneven skin tone

• Support collagen production, helping skin remain firmer and smoother

• Help reduce the appearance of fine lines over time

• Protect the skin from environmental free radical damage

• Support wound healing and recovery after inflammation

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Results are gradual rather than immediate. Most people begin noticing brighter skin within 4-8 weeks, while improvements in pigmentation and fine lines may take 2-3 months of consistent use.

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How does Vitamin C work?

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Every day, your skin is exposed to sunlight, pollution, smoke, stress, and other environmental factors. These create unstable molecules called free radicals, which damage healthy skin cells over time. This damage contributes to premature ageing, pigmentation, and collagen breakdown.

Vitamin C neutralises these free radicals before they can cause as much damage. It also plays an essential role in producing collagen—the protein responsible for keeping skin firm, plump, and youthful.

Think of Vitamin C as helping your skin to both protect itself today and repair itself over time.

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When should I use Vitamin C?

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Vitamin C is usually best applied in the morning because this is when your skin is preparing to face environmental stress throughout the day.

A simple morning routine might be:

1. Cleanser

2. Vitamin C serum

3. Moisturiser

4. Sunscreen (SPF 30-50)

Although Vitamin C can also be used at night, most people benefit most from using it during the day underneath sunscreen.

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How much should I use?

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A few drops (usually 3-5) are enough for the entire face.

Apply to clean, dry skin before moisturiser. Gently spread over the face and neck, avoiding direct contact with the eyes.

More product does not mean better results.

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Can I use Vitamin C every day?

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Yes.

If you're new to Vitamin C or have sensitive skin, begin using it 2-3 mornings per week before gradually increasing to daily use as your skin becomes accustomed.

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Different forms of Vitamin C

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Not all Vitamin C products are the same. There are several different forms, each with their own advantages.

L-Ascorbic Acid

This is the purest and most researched form of Vitamin C.

Pros:

• Strong scientific evidence

• Excellent brightening effects

• Supports collagen production well

• Works relatively quickly

Cons:

• Can sting sensitive skin

• Less stable and breaks down more easily

• Requires careful packaging and storage

Usually found in strengths between 10-20%.

Sodium Ascorbyl Phosphate (SAP)

A gentler, more stable form of Vitamin C.

Pros:

• Better tolerated by sensitive skin

• May help reduce acne-causing bacteria

• Stable formulation

Cons:

• Slightly slower acting than pure Vitamin C

Magnesium Ascorbyl Phosphate (MAP)

A hydrating and gentle Vitamin C derivative.

This is often recommended for people with dry or easily irritated skin.

Tetrahexyldecyl Ascorbate (THD Ascorbate)

A newer oil-soluble form of Vitamin C.

Pros:

• Very stable

• Penetrates deeply into the skin

• Suitable for sensitive skin

• Less likely to cause irritation

Although generally more expensive, it is becoming increasingly popular in premium skincare.

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Which Vitamin C is best?

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There isn't one single "best" form.

• If your skin is resilient and you're targeting pigmentation or ageing, L-Ascorbic Acid is often an excellent choice.

• If your skin is sensitive, dry or prone to redness, THD Ascorbate, MAP or SAP may be more suitable.

Your skincare professional can recommend the most appropriate option based on your skin concerns.

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Can Vitamin C be used with other skincare ingredients?

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Usually yes.

Vitamin C works particularly well alongside:

• Sunscreen

• Hyaluronic acid

• Ceramides

• Niacinamide

• Peptides

If using stronger active ingredients such as retinoids or exfoliating acids (AHAs/BHAs), some people prefer to separate them—using Vitamin C in the morning and retinoids in the evening—to minimise irritation.

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Who should use Vitamin C?

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Vitamin C is suitable for most adults who want to improve:

• Dull skin

• Uneven skin tone

• Pigmentation

• Early signs of ageing

• Fine lines

• Sun damage

• Overall skin brightness

It can usually be used safely by most skin types, including oily, combination and dry skin.

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Who should be cautious?

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Vitamin C may not be suitable if you:

• Have extremely sensitive or compromised skin

• Have active eczema or severe dermatitis on the treatment area

• Have a known allergy to ingredients within the formulation

• Have recently undergone certain skin treatments (your practitioner will advise when to restart)

If you have rosacea or very reactive skin, you may benefit from starting with a gentler derivative rather than pure L-Ascorbic Acid.

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Can Vitamin C cause irritation?

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Some people experience mild tingling when first using Vitamin C, particularly with L-Ascorbic Acid. This usually settles as the skin adapts.

If you develop significant burning, prolonged redness, swelling or persistent irritation, stop using the product and seek advice from your skincare professional.

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How should I store Vitamin C?

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Vitamin C is sensitive to:

• Light

• Air

• Heat

Exposure to these causes the ingredient to break down and become less effective.

To maximise its lifespan:

• Keep the bottle tightly closed.

• Store in a cool, dry place away from direct sunlight.

• Avoid leaving it in hot bathrooms or on windowsills.

• Do not transfer it into another container.

• Always replace the lid immediately after use.

Some people choose to store Vitamin C in the fridge, which can help extend stability, although this isn't essential unless recommended by the manufacturer.

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How do I know if my Vitamin C has gone off?

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Fresh Vitamin C serums are usually clear, pale yellow or very light amber.

If your serum becomes dark orange or brown, it has oxidised. While it isn't usually harmful, it is much less effective and should generally be replaced.

A noticeable change in smell or texture may also indicate the product has degraded.

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Does Vitamin C replace sunscreen?

No.

Vitamin C helps protect against environmental damage but does not protect your skin from UV rays.

Daily broad-spectrum SPF 30-50 remains the single most important anti-ageing skincare product.

When used together, Vitamin C and sunscreen provide greater protection than sunscreen alone.

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Key Take Home Messages

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• Vitamin C is one of the most effective ingredients for brighter, healthier-looking skin.

• It helps protect against environmental damage while supporting collagen production.

• Daily use delivers the best long-term results.

• Apply in the morning before moisturiser and sunscreen.

• Store correctly to prevent it breaking down.

• Consistency is far more important than using very high concentrations.

• Healthy, glowing skin develops gradually—expect visible improvements over several weeks rather than overnight.