An antioxidant-rich daily moisturizer combining stable Vitamin C, Matrixyl Synthe'6 peptide, Superoxide Dismutase, and deep-sea ferment biotechnology to hydrate, firm, and reduce fine lines.
PhiTo-Pep 1.6 brings together three categories of anti-aging actives that are rarely combined at meaningful concentrations in a single moisturizer: a stable Vitamin C derivative, a patented collagen-stimulating peptide, and deep-sea ferment biotechnology. The result is an antioxidant-rich daily lotion that hydrates, strengthens the barrier, reduces fine lines, and supports collagen production, all while delivering the signature Circadia deep-sea botanical scent profile.
Expanded Description
Vitamin C is the most studied antioxidant in topical skincare, with extensive clinical evidence for brightening hyperpigmentation, protecting against UV-induced oxidative damage, and stimulating collagen synthesis. The challenge is stability: L-ascorbic acid, the most bioavailable form, degrades rapidly in the presence of air, light, and water, making it difficult to formulate at effective concentrations that remain potent through a product's shelf life.
PhiTo-Pep 1.6 uses Tetrahexyldecyl Ascorbate (THDA), a highly stable, oil-soluble ester form of Vitamin C that does not degrade in the presence of light or air. THDA is one of the most lipophilic Vitamin C derivatives available, meaning it penetrates the skin's lipid-rich stratum corneum more effectively than water-soluble L-ascorbic acid. Clinical research on THDA supports its efficacy for brightening, antioxidant protection, and collagen support comparable to L-ascorbic acid at equivalent concentrations.
Palmitoyl Tripeptide-38 is Matrixyl Synthe'6, the most clinically documented peptide in skincare. The manufacturer reports that at 2%, it stimulates the production of six structural proteins (Collagen I, III, and IV, fibronectin, hyaluronic acid, and laminin 5), with clinical studies showing up to 31% reduction in forehead wrinkles after two months of daily use.
Pseudoalteromonas Ferment Extract and Vibrio Alginolyticus Ferment Filtrate are deep-sea microbial ferments from extreme marine environments. These bacteria survive at crushing depths by developing exceptional cellular protection mechanisms, which when applied to skin help resist environmental stressors and UV damage. They also contribute to the formula's non-comedogenic, exceptionally smooth skin feel.
Phormidium Persicinum Extract is a deep-sea algae extract that provides additional antioxidant and photoprotective support. Superoxide Dismutase is one of the body's own enzymatic antioxidants, capable of neutralizing superoxide radicals that standard antioxidants cannot address. Sea Water provides trace mineral enrichment. Helichrysum Stoechas Extract adds soothing and anti-inflammatory botanical support.
The "1.6" in the name refers to the formula's 1.6% Tetrahexyldecyl Ascorbate concentration, formulated at the level supported by clinical research.
PhiTo-Pep 1.6 uses Tetrahexyldecyl Ascorbate (THDA), a highly stable, oil-soluble ester form of Vitamin C that does not degrade in the presence of light or air. THDA is one of the most lipophilic Vitamin C derivatives available, meaning it penetrates the skin's lipid-rich stratum corneum more effectively than water-soluble L-ascorbic acid. Clinical research on THDA supports its efficacy for brightening, antioxidant protection, and collagen support comparable to L-ascorbic acid at equivalent concentrations.
Palmitoyl Tripeptide-38 is Matrixyl Synthe'6, the most clinically documented peptide in skincare. The manufacturer reports that at 2%, it stimulates the production of six structural proteins (Collagen I, III, and IV, fibronectin, hyaluronic acid, and laminin 5), with clinical studies showing up to 31% reduction in forehead wrinkles after two months of daily use.
Pseudoalteromonas Ferment Extract and Vibrio Alginolyticus Ferment Filtrate are deep-sea microbial ferments from extreme marine environments. These bacteria survive at crushing depths by developing exceptional cellular protection mechanisms, which when applied to skin help resist environmental stressors and UV damage. They also contribute to the formula's non-comedogenic, exceptionally smooth skin feel.
Phormidium Persicinum Extract is a deep-sea algae extract that provides additional antioxidant and photoprotective support. Superoxide Dismutase is one of the body's own enzymatic antioxidants, capable of neutralizing superoxide radicals that standard antioxidants cannot address. Sea Water provides trace mineral enrichment. Helichrysum Stoechas Extract adds soothing and anti-inflammatory botanical support.
The "1.6" in the name refers to the formula's 1.6% Tetrahexyldecyl Ascorbate concentration, formulated at the level supported by clinical research.
Skin Concern
Fine Lines and Wrinkles, Dullness, Hyperpigmentation, Loss of Firmness, Environmental Damage, Oxidative Stress
Skin Type
Normal, Combination, Dry, and Mature Skin Types. Especially beneficial for those targeting fine lines, dullness, hyperpigmentation, and loss of firmness. Ideal for anyone wanting a comprehensive antioxidant and anti-aging moisturizer in a single product.
Product Size
2 fl oz / 60mL | Antioxidant Lotion
Pro Tip
Apply PhiTo-Pep 1.6 over MeriStem Serum in the PM for a layered stem cell and peptide protocol. MeriStem addresses the cellular maintenance level; PhiTo-Pep delivers the structural building blocks. The THDA in PhiTo-Pep absorbs most effectively when the skin beneath it is already hydrated, making a water-based serum like MeriStem an ideal first layer.
How To Use Steps
PM use:
• After cleansing, apply Vitamin C Reversal Serum first (if using).
• Apply PhiTo-Pep 1.6 as your PM moisturizing step.
• Can also be used in the AM as a daily antioxidant moisturizer.
• Apply a small amount to face and neck and massage gently until absorbed.
• Follow with MeriStem Serum in the PM for a comprehensive anti-aging protocol.
• After cleansing, apply Vitamin C Reversal Serum first (if using).
• Apply PhiTo-Pep 1.6 as your PM moisturizing step.
• Can also be used in the AM as a daily antioxidant moisturizer.
• Apply a small amount to face and neck and massage gently until absorbed.
• Follow with MeriStem Serum in the PM for a comprehensive anti-aging protocol.
Ingredients
Tetrahexyldecyl Ascorbate (THDA, Stable Vitamin C): A highly stable, oil-soluble Vitamin C ester that penetrates the skin's lipid layer effectively and provides brightening, antioxidant, and collagen-stimulating benefits without the degradation issues of L-ascorbic acid.
Palmitoyl Tripeptide-38 (Matrixyl Synthe'6): The most clinically studied peptide in skincare. Stimulates the production of six structural skin proteins including collagen I, III, and IV at 2% concentration. Clinical studies show up to 31% wrinkle reduction after two months of daily use.
Superoxide Dismutase: An enzymatic antioxidant capable of neutralizing superoxide free radicals that standard antioxidants cannot address.
Pseudoalteromonas Ferment Extract and Vibrio Alginolyticus Ferment Filtrate: Deep-sea microbial ferments that provide exceptional environmental stress protection and a smooth, non-comedogenic skin feel.
Phormidium Persicinum Extract: A deep-sea algae extract with antioxidant and photoprotective properties.
Helichrysum Stoechas Extract: A botanical anti-inflammatory and antioxidant.
Full Ingredient List: Aqua, Glycerin, Hydrogenated Polyisobutene, Polysilicone-11, Cetearyl Alcohol, PEG-100 Stearate, Panthenol, Sea Water, Bis-PEG/PPG-16/16 PEG/PPG-16/16 Dimethicone, Cetearyl Glucoside, Tetrahexyldecyl Ascorbate, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Caprylyl Glycol, Butylene Glycol, Phenoxyethanol, Pseudoalteromonas Ferment Extract, Caprylic/Capric Triglyceride, Sodium Metabisulfite, Hexylene Glycol, Tetrasodium EDTA, Vibrio Alginolyticus Ferment Filtrate, Xanthan Gum, Ethylhexylglycerin, Tocopheryl Acetate, Fragrance, Laureth-12, Phormidium Persicinum Extract, Hydroxypropyl Cyclodextrin, Alanine, Proline, Serine, Helichrysum Stoechas Extract, Avena Sativa (Oat) Extract, Pentylene Glycol, Sodium Phosphate, Sodium Hydroxide, Potassium Sorbate, Sodium Benzoate, Superoxide Dismutase, Tromethamine, Palmitoyl Tripeptide-38.
Palmitoyl Tripeptide-38 (Matrixyl Synthe'6): The most clinically studied peptide in skincare. Stimulates the production of six structural skin proteins including collagen I, III, and IV at 2% concentration. Clinical studies show up to 31% wrinkle reduction after two months of daily use.
Superoxide Dismutase: An enzymatic antioxidant capable of neutralizing superoxide free radicals that standard antioxidants cannot address.
Pseudoalteromonas Ferment Extract and Vibrio Alginolyticus Ferment Filtrate: Deep-sea microbial ferments that provide exceptional environmental stress protection and a smooth, non-comedogenic skin feel.
Phormidium Persicinum Extract: A deep-sea algae extract with antioxidant and photoprotective properties.
Helichrysum Stoechas Extract: A botanical anti-inflammatory and antioxidant.
Full Ingredient List: Aqua, Glycerin, Hydrogenated Polyisobutene, Polysilicone-11, Cetearyl Alcohol, PEG-100 Stearate, Panthenol, Sea Water, Bis-PEG/PPG-16/16 PEG/PPG-16/16 Dimethicone, Cetearyl Glucoside, Tetrahexyldecyl Ascorbate, Acrylates/C10-30 Alkyl Acrylate Crosspolymer, Caprylyl Glycol, Butylene Glycol, Phenoxyethanol, Pseudoalteromonas Ferment Extract, Caprylic/Capric Triglyceride, Sodium Metabisulfite, Hexylene Glycol, Tetrasodium EDTA, Vibrio Alginolyticus Ferment Filtrate, Xanthan Gum, Ethylhexylglycerin, Tocopheryl Acetate, Fragrance, Laureth-12, Phormidium Persicinum Extract, Hydroxypropyl Cyclodextrin, Alanine, Proline, Serine, Helichrysum Stoechas Extract, Avena Sativa (Oat) Extract, Pentylene Glycol, Sodium Phosphate, Sodium Hydroxide, Potassium Sorbate, Sodium Benzoate, Superoxide Dismutase, Tromethamine, Palmitoyl Tripeptide-38.
