Skin-Nomad's Take — At a Glance

• Sea kelp ferment, niacinamide and hyaluronic acid with tremella in one serum
• Bouncy, water-based texture with a pale blue-silver tint from blue yarrow
• Suits dry to oily skin wanting hydration and firmness without weight

Firmness and hydration tend to come in separate bottles, and the firming one is typically the heavier of the two. CELESTINE puts both into a bouncy, water-based serum built on fermented sea kelp, niacinamide, hyaluronic acid and tremella mushroom. Earth Harbor Naturals, a US brand founded by a toxicologist and herbalist, built this serum around plant amino acids and marine ferments, and its blue-silver colour comes from blue yarrow rather than a dye.

Key Benefits

• Plant amino acids cushion the surface. Hydrolysed rice and pea proteins, which Earth Harbor calls bio-peptides, sit alongside proline and glycine, amino acids the skin uses to build its own collagen. They hold water at the surface for a smoother, plumper look. Earth Harbor reports that 94% of people testing it found their skin firmer and more supple.*
• Niacinamide evens tone and steadies oil. It limits how much melanin reaches the surface and prompts the skin to make more of its own ceramides, which is why it suits dry and oily skin equally.
• Hyaluronic acid and tremella hold water in two ways. Sodium hyaluronate binds water at the surface, and tremella mushroom extract forms a light, water-holding film of its own, with glycerin and betaine drawing more in behind them.
• Sea kelp ferment and seaweed support a calm, balanced surface. Lactobacillus-fermented kelp and Laminaria seaweed bring minerals and ferment by-products, while blue yarrow settles visible redness.

Texture & Finish

A light, bouncy serum that spreads easily and absorbs to a soft, hydrated finish with no stickiness. It has a fresh, herbal scent from the plant extracts and layers cleanly under moisturiser and sunscreen.

Ideal For

• Skin types: All skin types, from dry to oily and mature.
• Skin concerns: Dehydration, loss of firmness, fine lines, uneven tone and visible pores.
• Best used by: People who want firmness and hydration from one serum and prefer a plant-based formula to a synthetic peptide complex.

FAQ

Q: Are the "bio-peptides" the same as the peptides in other firming serums?
A: Not quite. Many firming serums use synthetic signal peptides made to a precise sequence, such as Palmitoyl Tripeptide-1. CELESTINE uses hydrolysed rice and pea proteins, broken down into short chains and amino acids, plus free proline and glycine. They hydrate and smooth the surface well; if you want a named, sequence-specific peptide, a synthetic peptide serum is the route for that.

Q: Does the lactic acid make this an exfoliating serum?
A: No. Lactic acid sits near the end of the list with the pH adjusters, and at that position it keeps the formula at the right acidity rather than resurfacing the skin. The serum is gentle enough for twice-daily use.

Q: Can I use it with vitamin C or retinoids?
A: Yes. Apply it after cleansing and any toner, before moisturiser, and in the morning finish with sunscreen. Niacinamide and hyaluronic acid sit comfortably alongside vitamin C in the morning and a retinoid at night.

The blue in the bottle is yarrow, not colouring, which tells you something about how the rest of the formula was put together.

* Earth Harbor's published results: 97% more hydrated, 94% firmer and more supple skin, 97% reduced fine lines and wrinkles, 94% more even tone and texture and 94% refined pores; timeframe not stated. Earth Harbor does not publish who ran the testing, how many people took part or the method. Results vary between individuals.

Explore more
Browse more serums, see our niacinamide formulas, or explore the full Earth Harbor Naturals range.