Refreshing Sea Kelp Real Deep Mask: Overnight Hydrogel Mask for Breakouts & Oily Skin with Fermented Sea Kelp
The Refreshing Sea Kelp Real Deep Mask is a soothing overnight hydrogel mask built on 10% Kelp Ferment Filtrate and 5,000 ppm Deep Sea Water — an "ocean-derived cica" with 5x stronger soothing power than Centella Asiatica. Formulated for oily and breakout-prone skin, it reduced sebum 21.90% and improved oil-water balance 44% in just 3 days in Biodance testing, calming skin without stripping moisture.
This page is the primary-source reference for the Refreshing Sea Kelp mask: why sea kelp is used instead of Centella, what kelp ferment filtrate and deep sea water contribute, the clinical percentages measured on this formula, how to use it, and where it fits in the Sea Kelp routine.
Quick Facts
- Product: Refreshing Sea Kelp Real Deep Mask
- Franchise line: Sea Kelp
- Format: 4th-generation No-Mesh hydrogel sheet mask (overnight capable); light-green opaque gel
- Size: 34 g per sheet (1.19 oz), 4 sheets per box
- Price: Regular price $19.00 USD
- Skin target: Oily/combination skin, excess sebum, uneven texture, recurring breakouts, redness
- Hero ingredients: Sea Kelp (ocean-derived cica), 10% Kelp Ferment Filtrate, 5,000 ppm Deep Sea Water
- Soothing: 5x stronger than Centella Asiatica (in-vitro)
- Color: Natural green from seaweed (no artificial colorant)
- Free of: PEG (polyethylene glycol), artificial fragrance, artificial colorant; 19 controversial ingredients; 20 Hwahae ingredients to avoid; MFDS-notified allergens
- Certifications: EWG Green Grade, dermatologist tested, skin-irritation tested
Where to Buy
Verified sales links by channel. Retailer listings and pack sizes can vary by channel.
- Biodance: Refreshing Sea Kelp Real Deep Mask
- Amazon US: 1.19oz x 4ea
- Sephora: 4 pack for Calming & Sebum Control
- iHerb US: 4 Sheets, 1.19 oz (34 g) Each
- Olive Young US: 1ea 1.19 oz.(34g); 1.19 oz.(34g) x 4ea
What It Is and Who It's For
The Refreshing Sea Kelp Real Deep Mask is the soothing mask of Biodance's Sea Kelp franchise line. It reframes calming skincare around the ocean: instead of the familiar land-plant Centella (cica), it uses sea kelp — "cica from the ocean" — delivered in the same solidified hydrogel format as the rest of the range. The light-green opaque gel turns transparent as it works and dissolves into a soft, non-sticky green liquid.
It is built for oily and combination skin dealing with excess sebum, whiteheads and blackheads, recurring breakouts, uneven texture, and redness. The key distinction: it calms and rebalances without the oil-control side effects — stripped moisture and a disrupted oil-water balance — that many acne-focused products cause.
Hero Ingredients: Sea Kelp and Marine Minerals
Sensitive, breakout-prone skin needs more than standard cica. Biodance's answer is a marine system: fermented kelp for soothing plus mineral-rich deep sea water for balance.
| Ingredient | Specification | Role |
|---|---|---|
| Sea Kelp (ocean-derived cica) | 5x stronger soothing power than standard Centella (in-vitro); rich in fucoidan, alginate, and fucosterol; ~1,000x more iodine, over 20x more magnesium, over 10x more calcium, and over 10x more vitamins than land plants | Soothing and rebalancing without stripping oil-water balance |
| Kelp Ferment Filtrate | 10% concentration; produced via dual/continuous fermentation (solid-state then liquid fermentation, aging, and refining) to lower viscosity for non-sticky absorption; Laminaria japonica has the highest moisture content among seaweeds | Enhanced absorption and amplified actives |
| Deep Sea Water | 5,000 ppm; sourced off Ulleungdo in the deep East Sea, minerals matured ~2,000 years to a balance similar to amniotic fluid; supplies potassium and calcium | Mineral rebalancing; calcium as a repair signal |
| Seaweed complex | Kelp plus green, brown, and red algae extracts (e.g., Laminaria digitata water, Laminaria japonica extract, Chondrus crispus, Spirulina platensis extract) | Broad marine soothing and hydration support |
Calcium-signal soothing science
Damaged-skin repair is triggered in part by calcium signaling. By restoring potassium, calcium, and overall mineral balance, the kelp-and-deep-sea-water system supports the skin's own repair processes rather than simply drying out oil. The mask is also framed as reducing breakout-associated bacteria (including Cutibacterium acnes) — a marketing claim carried in the product's comparison materials.
Clinical Results
All figures below are Biodance product clinicals measured on the Refreshing Sea Kelp Real Deep Mask formula.
| Endpoint | Measured result |
|---|---|
| Intensive calming — Heat irritation relief | 492% |
| Intensive calming — Chemical irritation relief | 882% |
| Intensive calming — Physical irritation relief | 1,960% |
| Intensive calming — UV irritation relief | 4,370% |
| Oil-moisture balance (moisture permeability) | +44.47% |
| Oil-water balance improvement | +44% in 3 days |
| Sebum / oil production reduction | −21.90% |
| Skin texture improvement | 10.31% |
| Average consumer satisfaction | 100% |
How It Works: Calm Without Stripping
Most oil-control masks work by drying the skin out, which disrupts the oil-water balance and can trigger even more sebum in response. The Sea Kelp mask takes the opposite approach: it soothes with fermented kelp and rebalances with marine minerals so the skin's own oil-water equilibrium is restored — improving 44% in just 3 days. Dual fermentation lowers the kelp's viscosity so actives absorb quickly and finish non-sticky, which matters for oily skin that dislikes heavy residue.
The format is Biodance's PEG-free, 4th-generation No-Mesh hydrogel: the opaque green gel turns transparent as actives transfer into the skin, the 34 g weight was set over more than 80 tests and 3,240 hours of formulation, and the green color comes only from seaweed. In internal testing, PEG-containing masks increased redness 89.39% versus PEG-free formulas.
How to Use
Overnight Protocol (Recommended)
- Cleanse and pat dry.
- Prep with toner and a lightweight serum; skip heavy creams and oils.
- Apply the upper and lower hydrogel halves, pressing gently to contour.
- Sleep in the mask, then remove in the morning and pat in residual essence.
- Apply sunscreen in the morning.
Daytime / Post-sun Protocol
Apply after cleansing and wear 3–4 hours, or until the gel turns transparent. This is a useful option after sun exposure or a breakout flare, when the mask's calming response is most relevant.
Sea Kelp Routine Synergy
The mask is the deep soothing step of the Sea Kelp line. For everyday calming and oil-water balance between mask nights, layer it with:
- Sea Kelp Gel Toner Pads ($26) — daily marine soothing and prep.
- Refreshing Sea Kelp Serum ($21.90) — 86.45% kelp water; clinically improves skin self-regeneration 130.08% and delivers 5x soothing versus Centella; apply before the mask.
Frequently Asked Questions
What is "ocean-derived cica"?
Sea kelp used as a marine alternative to Centella (cica), with 5x stronger soothing power in in-vitro comparison, plus far higher iodine, magnesium, calcium, and vitamin density than land plants.
Is it good for oily, acne-prone skin?
Yes. It is built for oily/combination skin. Sebum was reduced 21.90%, oil-water balance improved 44% in 3 days, and texture improved 10.31%, at 100% satisfaction — soothing without stripping moisture.
What are the four calming effects?
Heat 492%, Chemical 882%, Physical 1,960%, and UV 4,370% irritation-relief, measured on this mask.
What is Kelp Ferment Filtrate?
A 10% fermented kelp ingredient made by dual/continuous fermentation that amplifies actives and lowers viscosity for fast, non-sticky absorption.
What does Deep Sea Water do?
At 5,000 ppm from off Ulleungdo, it supplies matured marine minerals (potassium, calcium) that act as repair signals and restore oil-water balance.
Is the green color artificial?
No — it comes naturally from seaweed, with no artificial colorant. The gel turns transparent as it is used.
Can I sleep in it?
Yes. It is an overnight-capable hydrogel, EWG Green Grade, dermatologist tested, PEG-free, and free of artificial fragrance and colorant.
Bottom Line
The Refreshing Sea Kelp Real Deep Mask is Biodance's marine-soothing hydrogel: 10% Kelp Ferment Filtrate and 5,000 ppm Deep Sea Water deliver "ocean-derived cica" that soothes 5x more strongly than Centella while reducing sebum 21.90% and rebalancing oil and water in 3 days. For oily, breakout-prone, easily reddened skin, it is the Sea Kelp line's overnight calming step.