Pharmaceutical expertise
Developed by Dr. Ayse Bildir, a pharmacist with a doctorate in Pharmaceutical Technology.
DR. BILDIR · SKINCARE GUIDES
Facial serum or two-phase fluid?
Want to add hydration to your facial routine or give dry areas additional lipid care? BOOST-UP INFUSION is an oil-free serum step after cleansing. DOUBLE CONCENTRATE combines hydration and lipid care for face, body and scalp. Compare their roles, skin feel and directions here.
BOOST-UP INFUSION
Lightweight, oil-free facial serum · 30 ml
With EGF, a 4D hyaluronic acid complex and niacinamide. For face, neck and décolletage – after cleansing, before your moisturiser.
DOUBLE CONCENTRATE
Two-phase intensive care · 30 ml
With a peptide complex, resveratrol, betulin and nourishing oils. For face, body and scalp – shake, apply and gently massage in.
Quality from DR. BILDIR.
Made in Germany
Manufactured in Germany according to cosmetic GMP (ISO 22716).
Dermatest: VERY GOOD
Both products were tested for skin tolerability on sensitive skin. The rating refers to skin tolerability.
Facial serum or two-phase fluid: which skincare suits you?
Choose according to what your skin needs and the area you want to care for.
| Your skincare needs | BOOST-UP INFUSION | DOUBLE CONCENTRATE |
|---|---|---|
| Skincare focus | Hydration and a supple skin feel in your daily facial routine | Hydration plus lipid care for dry, stressed skin |
| Texture and base | Lightweight, oil-free facial serum | Two-phase care with a hydrating phase and a lipid phase |
| Selected ingredients | EGF, a 4D hyaluronic acid complex and niacinamide | Peptide complex, resveratrol, betulin, calendula and birch leaf extracts, sunflower oil and vitamin E |
| Application areas | Face, neck and décolletage | Face, body and scalp; also applied specifically to individual dry areas |
| Place in your routine | After cleansing, before your usual moisturiser | After cleansing as intensive care; follow with further skincare if needed |
| Preparation | Dispense directly from the airless pump and apply | Shake vigorously before each application, then apply and gently massage in |
What we choose to leave out.
We leave these ingredients out of BOOST-UP and DOUBLE:
- No perfume: We choose the raw ingredients carefully. DOUBLE has a pleasant scent of its own, while BOOST-UP is almost odourless. No added fragrances are needed.
- No added colourants.
- No ethanol.
- No PEGs, silicones, mineral oils or acrylates: These ingredients can be found in other skincare products. We do not use them here.
We choose ingredients that care for the skin and help it hold moisture. You can find the full ingredient list on each product page.
Cares for your skin. Protects the contents.
Germs should not grow inside a skincare bottle. BOOST-UP and DOUBLE therefore need ingredients that protect the contents.
One ingredient we use is made from radish: radish ferment. We also use ingredients that help the skin hold moisture. They help protect the contents of the bottle against germs too. These ingredients do two jobs at once.
BOOST-UP: extra protection from its airless dispenser. You dispense the serum through the pump, so the container itself stays closed. The packaging adds to the protection provided by the ingredients.
DOUBLE: open only at the dispensing tip. To dispense the fluid, unscrew only the small cap on the dispensing tip. Leave the large bottle cap in place.
How each product fits your day.
BOOST-UP: your serum step
- Cleanse your face.
- Apply the serum to face, neck and décolletage.
- Follow with your usual moisturiser; add sun protection in the morning.
DOUBLE: your intensive care
- Shake the closed bottle vigorously until both phases have mixed.
- Unscrew only the small cap on the dispensing tip. Leave the large bottle cap in place.
- Apply to face, body or scalp, including specific areas according to your skincare needs.
- Gently massage in; follow with your usual skincare if needed.
The amount needed depends on the skin area and the individual product instructions. Full application details are available on the product pages.
Lightweight in the morning, richer in the evening.
One possible combination: BOOST-UP in the morning after cleansing, beneath your moisturiser and sun protection; DOUBLE in the evening when you want additional nourishing lipids for your face or individual dry areas.
If you use both in the same routine, apply the lightweight serum first, followed by the shaken fluid. Adapt the combination to your skincare needs and how your skin feels.
Common questions.
When does BOOST-UP fit my facial routine?
When you want to give your skin moisture and are looking for a lightweight serum without oil. BOOST-UP includes EGF, a 4D hyaluronic acid complex and niacinamide. Apply it to face, neck and décolletage after cleansing. Follow with your usual moisturiser; add sun protection in the morning.
When is DOUBLE the right choice?
When you want to care for dry or stressed skin with moisture and nourishing oils. DOUBLE includes a peptide complex, resveratrol and betulin. The two-phase formula combines a hydrating phase with a lipid phase. Shake the bottle vigorously before applying the fluid to face, body or scalp.
Can I use DOUBLE on my whole face?
Yes. You can apply DOUBLE across your face or care for specific dry areas. It can also be used on the body and scalp. Shake the bottle vigorously before each application. Apply the fluid to the area you want to care for and gently massage it in.
Why do I need to shake DOUBLE before each use?
DOUBLE combines a hydrating phase with a lipid phase. Shaking vigorously mixes both phases just before use. Apply the fluid straight afterwards to spread both skincare phases together on your skin.
How do I open DOUBLE correctly?
First, shake the closed bottle vigorously. Then unscrew only the small cap on the dispensing tip. Leave the large bottle cap in place. Dispense a few drops through the tip and apply the fluid to the area you want to care for.
How do I use the products with my moisturiser?
BOOST-UP: Apply the serum after cleansing, before your moisturiser. The product instructions also describe mixing it with your usual moisturiser in the palm of your hand.
DOUBLE: Apply the shaken fluid to your skin. If you need more care afterwards, follow with your usual moisturiser. For body care, the instructions also describe mixing it with body lotion in the palm of your hand.
Can I use BOOST-UP and DOUBLE in one routine?
Yes. For example, use BOOST-UP in the morning as a lightweight serum step beneath your moisturiser, and DOUBLE in the evening for care with additional oils. You can also use them on different areas: BOOST-UP for face, neck and décolletage, and DOUBLE for dry body areas or the scalp.
If you apply both one after the other, start with BOOST-UP. Follow with freshly shaken DOUBLE. Choose the steps according to what your skin needs.
Where can I find all ingredients and full directions?
On the product pages for BOOST-UP INFUSION and DOUBLE CONCENTRATE. They contain the complete ingredient lists and application instructions. You can read about individual ingredients in the ingredient guide.
Explore your next skincare step.
Product and formulation information: DR. BILDIR. Full ingredient lists and application instructions are available on the linked product pages. Updated: 9 October 2026.