Understanding Active Ingredients
The ingredients that do the heavy lifting—used the right way.
Active ingredients are the components in skincare that are included to create a specific effect on the skin. They may help exfoliate, brighten, improve skin texture, reduce excess oil or support skin renewal.
Unlike moisturising or texture-enhancing ingredients, active ingredients are designed to make noticeable changes to the skin. While they can be highly effective, they're also the ingredients most likely to cause irritation if introduced too quickly or combined incorrectly.
Understanding how to use active ingredients safely is one of the most important steps in building an effective skincare routine.
The Most Common Active Ingredients
Exfoliating Acids (AHAs & BHAs)
Examples
- Glycolic Acid
- Lactic Acid
- Mandelic Acid
- Salicylic Acid (BHA)
What do they do?
Exfoliating acids help remove dead skin cells, leaving skin looking smoother, brighter and more even.
Best for
- Dull skin
- Uneven texture
- Congested pores
- Pigmentation
- Breakouts
Things to know
Start slowly and avoid over-exfoliating. Daily SPF is essential when using exfoliating acids.
Retinoids (Including Retinol)
What are they?
Vitamin A derivatives that support skin renewal and help improve the appearance of fine lines, uneven texture and blemishes.
Best for
- Fine lines
- Acne
- Pigmentation
- Uneven skin texture
Things to know
Retinoids should be introduced gradually. Mild dryness or flaking is common when first starting. Always wear SPF during the day.
Vitamin C
What is it?
A powerful antioxidant that helps brighten the complexion while protecting against environmental stress.
Best for
- Dull skin
- Uneven skin tone
- Pigmentation
- Skin longevity
Things to know
Vitamin C is commonly used in morning routines before sunscreen.
Niacinamide (Vitamin B3)
What is it?
A versatile ingredient that supports the skin barrier while helping improve overall skin health.
Best for
- Oily skin
- Redness
- Pigmentation
- Enlarged pores
- Barrier support
Things to know
One of the most well-tolerated active ingredients and suitable for most skin types.
Azelaic Acid
What is it?
A multi-purpose active that helps reduce redness, improve uneven skin tone and support blemish-prone skin.
Best for
- Acne
- Redness
- Rosacea-prone skin
- Pigmentation
Things to know
Often suitable for sensitive skin and can be used alongside many other ingredients.
Benzoyl Peroxide
What is it?
An antibacterial ingredient used to help manage acne breakouts.
Best for
- Inflamed acne
- Persistent breakouts
Things to know
Can cause dryness and may bleach fabrics, including towels and pillowcases.
Peptides
What are they?
Short chains of amino acids that help support the skin's natural collagen-building processes.
Best for
- Fine lines
- Loss of firmness
- Skin longevity
Things to know
Peptides are generally well tolerated and work well as part of a long-term skincare routine.
How to Introduce a New Active Ingredient
To reduce the risk of irritation:
- Start with the lowest suitable strength where possible.
- Use it 2–3 evenings per week, rather than every day.
- Patch test before applying it to your whole face.
- Introduce one new active ingredient at a time.
- Give your skin 2–3 weeks to adjust before introducing another.
- Always apply broad-spectrum SPF every morning, as many active ingredients increase sun sensitivity.
If your skin becomes uncomfortable, reduce how often you use the product rather than continuing through irritation.
Can You Combine Active Ingredients?
Some active ingredients work well together, while others are better used separately.
Generally Safe Combinations
Niacinamide + Most Active Ingredients
Niacinamide is one of the most versatile ingredients and layers well with most skincare routines.
Vitamin C (Morning) + Retinoid (Evening)
Using Vitamin C in the morning and a retinoid in the evening allows you to benefit from both without applying them at the same time.
Hyaluronic Acid + Any Active
Hyaluronic Acid is hydrating rather than exfoliating, making it suitable alongside almost every active ingredient.
Combinations That Need More Care
Retinoids + Exfoliating Acids
Both encourage skin renewal, so using them together may increase dryness or irritation.
Recommendation: Consider alternating them on different evenings.
Vitamin C + Strong Exfoliating Acids
Using several acidic products within the same routine may increase skin sensitivity.
Recommendation: Many people prefer Vitamin C in the morning and exfoliating acids in the evening.
Benzoyl Peroxide + Retinoids
Applying both at exactly the same time may reduce their effectiveness and increase irritation.
Recommendation: If advised by a healthcare professional, many people use one in the morning and the other in the evening.
Suggested Routine
Morning
Gentle Cleanser → Vitamin C (or another suitable antioxidant) → Moisturiser → Broad-spectrum SPF
Evening
Gentle Cleanser → One Active Ingredient → Moisturiser
Tip: Resist the temptation to use multiple active ingredients in one routine. More isn't always better.
When Should You Pause Active Ingredients?
If your skin becomes:
- Tight
- Dry
- Red
- Flaky
- Sensitive
- Uncomfortable
or your skin barrier feels compromised, simplify your routine.
Return to a gentle cleanser, barrier-supporting moisturiser and daily SPF until your skin feels comfortable again. Once your skin has recovered, reintroduce active ingredients gradually—one at a time.
Less Is Often More
The most effective skincare routines aren't usually the most complicated.
Choosing the right active ingredients for your skin, introducing them gradually and using them consistently is often far more effective than using multiple powerful products at once.
Healthy skin is built through patience, consistency and daily sun protection—not by using the strongest ingredients available.