#1 The Strengthening Serum (Formerly #1 The Serum)
This strengthening serum supports skin barrier function by harnessing Vitamin B (niacinamide), restoring radiance as it amplifies hydration. Ideal as part of your morning routine, niacinamide helps to visibly even the appearance of skin tone and improve skin clarity.
Use in the AM
Complimentary delivery on all orders.
New Names, Same Favourite Formulations
In the coming weeks and months, you’ll begin to see a shift in how our formulations and collections are named and presented on our packaging.
This change is small, but significant—and intended to support client navigation, education, and discoverability when it comes to exploring the RATIONALE range. It’s an evolution we’re proud to be bringing you on.
An Icon, Upsized
To celebrate #1 The Strengthening Serum’s icon status, a special 1.7 fl.oz size has been released for a limited time, presented in gift-ready packaging.
The Ritual
Rinse your face with tepid water. Pat dry.
Dispense 2-3 drops into palm.
Smooth gently over face, neck, décolletage and backs of hands. Use as the first step of your morning ritual, for strengthened, hydrated skin.
#1 For a Reason
A non-negotiable first step in your morning ritual, this supercharged niacinamide serum targets a range of common skin concerns whilst building a strong structural foundation for stronger, hydrated, healthy-looking skin.
The Results
91%
reported improved skin hydration.
82%
saw a boost in radiance.
82%
experienced enhanced skin nourishment.
*Based on a 56-day trial with 22 participants
Active Ingredients
An Advanced Protective Duo
This dynamic daytime duo works synergistically to support the skin’s barrier with a Vitamin B Complex, while Zinc Fusion Technology visibly evens tone and delivers solar and environmental protection. Together, these two formulations work to maintain hydration and support the skin’s natural defences against environmental aggressors.
The Research
Healthy looking skin is supported by a natural defence system that works daily to protect and repair. This system includes the skin barrier, immune function, inflammation response, and the skin microbiome.
The outer layer of the skin helps retain moisture while defending against environmental stressors such as pollution and changing weather conditions. Immune cells work beneath the surface to detect potential irritants and help maintain balance, while inflammation plays a vital role in protection and repair when needed.
Together, these systems work in harmony to support a healthy, resilient complexion, further supported by B Vitamins.
“#1 The Strengthening Serum is my all-time favourite product. I love how it instantly calms and hydrates my skin, leaving it looking glowy and radiant.” — Jasmine
Frequently Asked Questions
#1 The Strengthening Serum is the first step in your morning ritual. Start by rinsing your skin with tepid water and pat dry. Apply 2-3 drops of #1 The Strengthening Serum before applying hydragels, crèmes and SPF.
Yes, #1 The Strengthening Serum is suitable for all skin types.
Our B Vitamin Complex works to strengthen the skin’s barrier function. Skin appears calmer and more hydrated as redness and irritation are reduced.
The key ingredients in #1 The Strengthening Serum include a B Vitamin Complex including niacinamide, with a combination of vitamins and peptides.
Niacinamide strengthens the skin’s barrier and enhances skin resilience. With its anti-inflammatory properties, niacinamide visibly soothes redness and brightens uneven skin tone for a healthier complexion.
Yes, #1 The Strengthening Serum 0.5 fl.oz travel size is a permanent offering.
#1 The Strengthening Serum supports skin barrier defence with a B Vitamin Complex (niacinamide), while #2 The Serum defends skin from oxidative stress with a Complex of Antioxidants. It is recommended to use one formulation from #1 The Strengthening Collection and one from #2 The Brightening Collection to optimise skin health.
A serum is primarily water-based, offering a light consistency and quick delivery. On the other hand, hydragels, although lightweight, contain a combination of water and oil, resulting in a slower delivery in comparison.
Yes, #1 The Strengthening Serum can be used during pregnancy and breastfeeding, especially for those experiencing signs of dehydration, blemishes, and congestion. If you have any concerns or further questions about using active ingredients in skincare during pregnancy, we always recommend consulting your medical practitioner.
Yes, #1 The Strengthening Serum is suitable to be incorporated into your routine. Due to niacinamide, ceramides and amino acids harnessed in this formulation, impaired and reactive skin types will experience an increase in skin nourishment and barrier function fortification, as hydration and skin suppleness is restored.