Why is this serum two-phase, and why is activation important?
The serum contains its active ingredients in two separate phases – a dry (powder) phase and a water-based solution. This design prevents premature oxidation of the vitamin C. Activation happens only once, before the first use: by pressing the pump, the two phases combine, creating a freshly mixed serum with maximum potency right before application.

How do I activate the serum?
Before the first use, firmly press down the pump to release the powder from the inner capsule into the liquid. Shake well for at least 60 seconds, then let it rest for a minimum of 6 hours. After this, the serum will be fully dissolved and ready for daily use.

How often should I use the serum?
For best results, use daily on clean, dry skin before applying other serums or moisturizers.

When should I use it – in the morning or at night?
Vitamin C is especially effective in the morning routine, as it enhances the performance of sunscreens and provides extra protection against oxidative stress throughout the day.
Its lightweight, water-like texture absorbs quickly, making it perfect for busy mornings — ideal under makeup or a moisturizer with SPF.
Of course, it can also be used in the evening, but if you have to choose, morning use is strongly recommended. When used during the day, always follow with at least SPF 30 broad-spectrum sunscreen.

How long does the activated serum stay fresh?
For optimal efficacy, it’s recommended to use the serum within 3 months after activation.
If you wish to extend its freshness, store it in the refrigerator — this helps maintain the stability of vitamin C and preserves the serum’s effectiveness for longer.

Which active ingredients can be combined with this serum? Can I use exfoliants with it?
The Vitamin C + Glutathione Serum fits easily into most skincare routines, but it’s worth building the rest of your actives around it thoughtfully.

Works well with:

• Niacinamide – strengthens the skin barrier and helps even out skin tone.
• Hyaluronic acid – an excellent partner for boosting hydration and achieving a plump, radiant complexion.
• Other antioxidants – such as vitamin E or ferulic acid, which work synergistically to enhance the antioxidant power of vitamin C.
• Alpha-arbutin and kojic acid – a gentle yet effective combination for dark spots and sun damage.
• Azelaic acid – complements vitamin C well, especially for skin prone to pigmentation or post-acne marks. They can be used together in one routine, or alternated (e.g., vitamin C in the morning, azelaic acid at night).
• Peptides – support collagen and elastin production, promoting skin regeneration and enhancing the firming effect of vitamin C.
• Sunscreen – highly recommended for daytime use, as vitamin C boosts the protective effect of UV filters.

Use with caution or alternate use:

• Acid exfoliants (AHA, BHA, PHA) – these low-pH formulas act similarly to vitamin C. They can be used together if your skin is already accustomed to acids.
  If you use vitamin C in the morning, apply your exfoliant in the evening instead.
  If you prefer to use both in one routine, follow the “thinnest to thickest” rule: apply the exfoliant first, then the vitamin C serum, and choose a mild exfoliating formula.
  If irritation occurs, separate their use by time (morning/evening) or alternate days.

Avoid using at the same time as:

• Retinol or strong retinoids, as combining them can cause irritation. Use them in different routines — for example, vitamin C in the morning and retinol at night, or on alternate days.