Shop
Connect
Join Our Community
Hydrating Serum + Multi-HA
$42.49/mo
COSMOS Natural
99% Natural Origin
All Skin Types
Vegan
Hydrating Serum + Multi-HA
1.01 fl oz (30ml)
A lightweight, silk-texture serum that gives skin a deep moisture boost for a fresh, healthy look all day. A dual hyaluronic acid complex works at two depths — surface and below — while Bisabolol soothes and Cloudberry and Peony extracts deliver antioxidant nourishment. 99% natural origin, COSMOS Natural certified.
Dual-depth hydration with Hydrolyzed HA + Sodium Hyaluronate
Soothes and calms with Bisabolol — suitable for sensitive skin
Nourishes with Cloudberry and Peony extracts
Natural fragrance from essential oils · vegan · all skin types
Day 1
Instant hydration
Dryness and tightness ease immediately
Week 1–2
Glow & softness
Dewy, plump complexion all day
Week 3+
Lasting results
Consistently hydrated, radiant skin
Purchase Option
Free Shipping
30-Day Guarantee
ECOCERT Certified
1
Cleanse your skin
Begin with a gentle cleanser, morning or evening. Pat dry leaving skin slightly damp for optimal absorption.
2
Apply the serum
Dispense 2–3 drops onto fingertips. Gently press and pat into face and neck. Allow a moment to absorb.
3
Follow with moisturiser or oil
For dry skin, layer a moisturiser or the Facial Oil on top to seal in the hyaluronic acid. Can also be used under makeup as a hydrating base.
4
Use morning and evening
Unlike acids, this serum can be used twice daily. Most customers notice improved hydration within days and a fresher complexion within 1–2 weeks.
Hydrolyzed Hyaluronic Acid
Lower molecular weight — penetrates deeper into the skin to plump fine lines and deliver lasting hydration from within.
Sodium Hyaluronate
Works at the surface to instantly smooth and soften skin, locking in moisture throughout the day.
Bisabolol
A naturally derived ingredient from chamomile that calms irritation, reduces redness, and makes this serum suitable for all skin types including sensitive and reactive.
Cloudberry Fruit Extract
An Arctic superfruit rich in vitamins C and E and antioxidants, protecting skin from environmental damage while supporting a healthy, radiant complexion.
Peony Root Extract
Delivers essential nutrients to support skin vitality and an even-looking complexion.
Alteromonas Ferment Extract
A marine-derived ingredient that strengthens the skin barrier and supports long-lasting hydration retention.
Full Ingredient List (INCI)
Aloe Barbadensis (Aloe) Leaf Juice*, Simmondsia Chinensis (Jojoba) Seed Oil*, Glycerin†, Pentylene Glycol, Rosa Damascena (Rose) Flower Water*, Polyglyceryl-6 Stearate, Cetearyl Alcohol, Isoamyl Laurate, Aqua, Betaine, Polyglyceryl-6 Behenate, Parfum, Cellulose, Caprylic/Capric Triglyceride, Xanthan Gum, Bisabolol, Paeonia Lactiflora (Peony) Root Extract, Rubus Chamaemorus (Cloudberry) Fruit Extract*, Ascorbyl Palmitate, Hydrolyzed Hyaluronic Acid, Sodium Hyaluronate, Sodium Phytate, Tocopherol, Benzyl Alcohol, Alteromonas Ferment Extract, Phenethyl Alcohol, CI 77491 (Iron Oxides)‡, Sodium Benzoate, Potassium Sorbate, Potassium Hydroxide, Glycolipids, Limonene**, Geraniol**, Coumarin**, Linalool**
* Ingredients from organic farming · † Made using organic ingredients · ** From natural essential oils · ‡ Pure mineral pigments
* Ingredients from organic farming · † Made using organic ingredients · ** From natural essential oils · ‡ Pure mineral pigments
99%
Natural Origin
Every ingredient is derived from natural sources. No synthetic additives.
25%
Organic Content
Certified organic ingredients including aloe, jojoba, rose water, and cloudberry.
✓
COSMOS Natural
Certified by ECOCERT — the global standard for natural and organic cosmetics.
Also: 100% vegan · cruelty-free · natural fragrance from essential oils · suitable for all skin types · ethically sourced botanicals.
The Science
Dual-depth hydration — how it works
Hydrolyzed HA + Sodium Hyaluronate — Dual Hydration
Two forms of hyaluronic acid working at different skin depths — Hydrolyzed HA penetrates deeper to plump fine lines, while Sodium Hyaluronate works at the surface for all-day moisture that doesn't fade.
Bisabolol — Soothing Comfort
A naturally derived ingredient that calms irritation and reduces redness, making this serum suitable for all skin types including sensitive and reactive. Used in dermatology for decades for its proven soothing properties.
Cloudberry Fruit Extract — Antioxidant Nourishment
An Arctic superfruit extraordinarily rich in vitamins C and E and antioxidants. Protects skin from environmental damage while nourishing for a healthy, radiant look. Sourced from organic farming.
Alteromonas Ferment Extract — Barrier Support
A marine-derived ingredient that strengthens the skin barrier and supports long-lasting hydration retention. Helps skin maintain moisture even in challenging conditions like air conditioning or cold weather.
Why Citadel Skin
Why Citadel Skin stands apart
| Citadel Skin | Typical Brands | |
|---|---|---|
| 99% natural origin ingredients | ✓ | ✗ |
| COSMOS Natural certified | ✓ | ✗ |
| Dual hyaluronic acid complex | ✓ | ✗ |
| Bisabolol for sensitive skin | ✓ | ✗ |
| 100% vegan & cruelty-free | ✓ | ✗ |
| Antioxidant botanical extracts | ✓ | ✗ |
| Subscribe & save 15% | ✓ | ✗ |
Complete Your Routine
Pairs well with
Peptide Renewal Serum
Use the Hydrating Serum in the morning, Peptide Serum in the evening for a complete routine.
All-In-One Facial Oil
Layer the Facial Oil on top of the serum to seal in moisture for maximum hydration.
AHA Peeling Concentrate
Use the morning after AHA nights — the Hydrating Serum replenishes and soothes post-exfoliation.
Customer Reviews
Real results from real customers
★★★★★
"My flaky winter skin was a mess until I started using this. Two pumps morning and evening and my face feels like silk — no more tight dryness, and that dewy glow is unreal. Lightweight, non-sticky, and I've gotten compliments left and right."
Sophia✓ Verified Purchase
★★★★★
"This serum is magic — a couple drops morning and night, and it sinks right in, leaving everything super soft and glowy. No sticky residue, just hydration that lasts all day. Feel like I shaved off years!"
Emma✓ Verified Purchase
★★★★★
"This serum legit saved my skin this winter. I was dealing with that awful tight, flaky mess around my nose and cheeks, and this stuff plumps everything right up without feeling sticky at all."
Sarah✓ Verified Purchase
★★★★★
"I've tried so many serums that felt heavy or left my skin sticky — this one is completely different. It absorbs instantly, my skin feels plump and soft all day, and my makeup sits so much better on top."
Elena✓ Verified Purchase
★★★★★
"My reactive skin finally has something it loves — no redness, no tightness, just calm and soft from the first use. Gentle but powerful, perfect for my sensitive face. Feels like a hug for my skin."
Harper✓ Verified Purchase
★★★★★
"Post-wash tightness was ruining my life. This fixed everything. No more dry patches screwing up my makeup by lunch. It's light and sinks in fast. 10/10 would buy again."
Mike✓ Verified Purchase
FAQ
Questions? We have answers.
The Hydrating Serum is suitable for all skin types including sensitive skin. Its gentle, natural-origin formula is lightweight and non-greasy, making it ideal for daily use morning and evening.
Most customers notice improved hydration and reduced tightness from day one. A fresher, more radiant complexion typically appears within 1–2 weeks of consistent use.
Yes — this serum works beautifully as a hydrating base under makeup. It absorbs quickly without pilling and helps foundation apply more smoothly and last longer.
Yes — the serum is gentle enough to use around the eye area. Apply to the orbital bone and allow to absorb. Avoid direct contact with eyes.
Yes, this serum pairs well with most skincare. Use it in the morning alongside the Peptide Serum at night, or the morning after AHA use to replenish moisture.
30-day money back guarantee on all products. If you're not satisfied, reach out and we'll refund you in full. No complicated process, no questions asked.
Your skin, properly hydrated.
Dual hyaluronic acid. Botanical antioxidants. 99% natural origin. The hydration your skin has been looking for.