If you've ever wondered why your moisturizer doesn't seem to make a lasting difference to your skin, the answer is likely molecular.
Hyaluronic acid — the most studied hydrating ingredient in modern skincare — is not a single compound. It exists in a range of molecular weights, and each weight behaves differently in skin. Large, high-molecular-weight HA molecules sit on the surface of skin, forming a hydrating film that reduces water evaporation and provides immediate plumping. Smaller, lower-molecular-weight and hydrolyzed forms penetrate beyond the surface — reaching the upper dermis, where collagen fibres live and where structural hydration makes the most meaningful difference to the visible signs of aging.
Most moisturizers — even high-quality ones — contain a single form of HA. That means they're hydrating one layer of your skin while leaving the rest unaddressed.
The Erithacus Collagen-Boosting Cream was designed to change that.
The 4-Form HA System
Erithacus contains four distinct forms of hyaluronic acid, each targeting a different depth of skin: Sodium Hyaluronate delivers immediate surface hydration, plumping, and barrier reinforcement. Hydrolyzed Hyaluronic Acid penetrates into the upper dermis with its smaller molecular profile. Hydrolyzed Sodium Hyaluronate — nano HA — reaches the deepest accessible layers of the skin where long-term structural hydration begins. Sodium Hyaluronate Crosspolymer forms a sustained moisture-locking film on the surface that reduces transepidermal water loss throughout the day.
Together, they create a complete, multi-depth hydration system. Clinical data on multi-weight HA formulas shows measurable reduction in deep wrinkle depth and improvement in skin texture roughness by up to 10%, with hydration benefits lasting up to 48 hours — and measurable moisture improvement for up to 5 days after a single application.
Marine Biotechnology: The Plankton Extract Advantage
Among the most distinctive ingredients in Erithacus is Plankton Extract — a marine bioactive that has attracted increasing attention in dermatological skincare science.
Plankton are among the most UV-resilient organisms on Earth. Millions of years of evolution under intense solar radiation has equipped them with extraordinary antioxidant and photoprotective compounds. Plankton Extract brings that same resilience to human skin: potent antioxidant activity, photoaging defense at the cellular level, and support for skin renewal and barrier integrity.
In the context of an anti-aging moisturizer, Plankton Extract serves as a protective partner to the HA system — helping shield the collagen and hydration you're building from the oxidative stress that degrades it.
Complete Antioxidant Defence
Erithacus pairs its HA complex and Plankton Extract with a comprehensive antioxidant array: Vitis Vinifera (Red Grape) Fruit Cell Extract, one of the most potent free-radical scavengers available in cosmetic formulation; Tocopheryl Acetate (Vitamin E) for barrier repair and antioxidant protection; and Pyrus Malus (Apple) Fruit Extract for gentle skin renewal support and brightening.
Firming, Humectants, and Advanced Carrier Technology
Pullulan — a biotechnology ingredient produced through fermentation — delivers a visible instant-firming effect on application by forming a lightweight tightening film across the skin surface. Trehalose, Glycerin, and Serine form a triple humectant complex that draws and holds moisture within the skin. Urea provides deep hydration with mild keratolytic properties that improve skin smoothness and ingredient absorption. The formula's proprietary Trans-Epidermal Carrier technology ensures that active ingredients penetrate to where they work — not just where they feel good.
Who Is Erithacus For?
Recommended for: All skin types — Normal · Dry · Combination · Sensitive · Mature
Particularly beneficial for: Dehydrated skin, collagen-depleted skin, photoaged skin, mature and post-menopausal skin, and anyone seeking a complete anti-aging moisturizer.
Sulfate-free. Paraben-free. Medical grade.
Directions: Apply to clean skin morning and evening as the final step of your skincare routine. For optimal hydration, apply to slightly damp skin. In the morning, follow with broad-spectrum SPF.
SKU: STK-CRM-ERTH | 1.0 oz (28g)
Hydrate your skin — at every layer. That's what Erithacus is for.