Vitamin C for Sensitive Skin: Benefits, Types & Why Natural Vitamin C Works Better
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What does vitamin C do for your skin?
Vitamin C is an essential antioxidant that plays a critical role in collagen production, skin repair and protection against environmental damage. Our skin relies on vitamin C to maintain firmness, brightness and elasticity, which is why it is one of the most sought-after skincare ingredients.
Vitamin C can be consumed through food, but topical application delivers targeted benefits by helping to brighten the complexion, even skin tone and protect the skin from daily environmental stress. When used consistently, it supports long-term skin resilience rather than short-term glow.
Natural vs synthetic vitamin C: what is the difference?
Not all vitamin C is created equal. In skincare, vitamin C generally falls into two categories: natural (plant-derived) and synthetic (lab-made).
Natural vitamin C
Natural vitamin C is extracted from plants and exists alongside a complex profile of phytonutrients, including bioflavonoids, enzymes and antioxidants. These naturally occurring compounds support absorption, stability and effectiveness within the skin.
Rather than acting alone, natural vitamin C works as part of a broader ecosystem, helping skin use it more efficiently and gently - particularly important for sensitive or reactive skin.
Synthetic vitamin C
Synthetic vitamin C is manufactured in laboratories, often derived from corn syrup or acetone. It delivers vitamin C in an isolated form and typically requires additional stabilisers or synthetic ingredients to aid penetration.
Common synthetic vitamin C derivatives include:
• L-Ascorbic Acid
• Magnesium Ascorbyl Phosphate
• Sodium Ascorbyl Phosphate
• Ascorbyl Glucoside
• Ascorbyl Palmitate
• Ester-C
Synthetic vitamin C is not inherently bad - many formulas can be effective - but they do not contain the naturally supportive compounds found in plant-based sources, and some can be irritating for sensitive skin.
Why we choose natural vitamin C
At Cactus, we prioritise skin barrier health and long-term calm, which is why we exclusively use natural, plant-based vitamin C.
Here is why:
1. Better absorption and more benefits
Natural vitamin C comes with bioflavonoids and antioxidants that help the skin absorb and use vitamin C effectively. This supports brighter skin, improved collagen production and a stronger barrier.
2. Skin-friendly pH
Plant-derived vitamin C sits closer to the skin's natural pH (around 6), whereas pure ascorbic acid requires a very acidic environment (pH 1-2.5) to work, which can trigger irritation and sensitivity.
3. Greater stability
Synthetic vitamin C oxidises easily when exposed to air or light, reducing its effectiveness before it even reaches the skin. Natural vitamin C remains protected within plant cell structures, helping it stay stable and active.
4. Antioxidant protection without UV sensitivity
Natural vitamin C helps defend against oxidative stress and environmental damage. It is not a sunscreen, but unlike some synthetic forms, it does not increase UV sensitivity.
The vitamin C we use in our Protective Day Serum
Our Protective Day Serum is formulated to deliver daily antioxidant protection, gentle brightening and barrier support for sensitive skin.
Designed for daytime use, it helps protect skin from pollution, environmental stress and premature ageing, while supporting calm and hydration throughout the day.
How to start using the Protective Day Serum
Even natural vitamin C is active, so it is best to introduce it gradually.
We recommend:
• Start 2-3 times per week
• Build up to daily use as your skin adapts
The Protective Day Serum is formulated for sensitive skin and includes calming, barrier-supporting ingredients to help skin adjust comfortably.
If you are using synthetic vitamin C products, avoid pairing them with exfoliating acids (glycolic, lactic or salicylic) at the same time, as this can disrupt pH and reduce effectiveness.
How to layer the Protective Day Serum
The Protective Day Serum is suitable for all skin types and designed to be used in the morning.
Oily or combination skin
• Use alone as a lightweight daytime hydrator
• Layers beautifully under sunscreen and makeup
Normal to dry skin
Layer as follows:
• Protective Day Serum
• Moisturiser
• Sunscreen
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