Formulated for Skin Microbiome Type 4, Cepheus: Active Phage Serum contains a targeted phage cocktail, containing over 1 billion phages per mL, that combats your specific strains of issue-causing S. aureus bacteria. Powered by Parallel’s unique, high-titer phage technology, Cepheus naturally knocks back your bad bacteria and enables good bacteria to grow, supporting balance, clarity, and radiance. Dermatologist-approved for healthy, youthful, more resilient skin.  

30 ml

This product contains Retinol. It should be avoided for those who are actively trying to get pregnant, are pregnant, or are breast feeding.

Regular price $165.00
Sale price $165.00 Regular price

• Lightweight, hydrating texture. Absorbs quickly and completely for daily optimization and hydration
• Formulated without irritants, parabens, pthalates, fragrances, or allergens
• Microbiome-friendly and non-comedogenic
• Vegan and cruelty-free

Key Benefits

• Supports more resilient skin by targeting bad bacteria and allowing good bacteria to grow
• Balances and calms stressed, overly reactive skin. Reduces the appearance of blemishes & breakouts, inflammation, and redness
• Improves tone and smooths texture for brighter, more even-looking skin. Boosts skin’s natural radiance
• Nourishes and hydrates for supple, refreshed skin
• Supports the skin microbiome, protecting against environmental aggressors and oxidative stresses such as pollution

Visible Results

• 100% agree skin feels calmer and more supple
• 98% agree skin appears clearer
• 96% agree skin texture has improved
• 93% agree complexion looks lifted and tighter
• 90% agree skin looks healthier than ever before.


Water, Propanediol, Niacinamide, Butylene glycol, Linatural ® Ultra-3, Sodium PCA, Glycerin, Vegelight, Linatural ® Ultra-3, PS1-Everyday Phage Complex, Isoamyl laurate, Gotu Kola Extract, Shea Butter Glycerides, 3 glyceryl-ascorbate, Xanthan Gum, Polysorbate 20, Retinol Liposome PF, Salicylic acid solution, Vit E Acetate, Calcium chloride, Ferulic Acid, Magnesium chloride

Formulated without parabens, sulfates, phthalates, mineral oil, petroleum, formaldehyde, triclosan, silicone, and dimethicone.

How to Use

Recommended usage instructions (morning & night to start):

• Apply 2-3 pumps of Cepheus: Active Phage Serum to clean, dry skin, covering the entire face or other skin area you wish to support
• (Recommended) Follow with Parallel's Daily Reset: Skin Barrier Protecting Moisturizer
• Important Note: Do not use in combination with products containing benzoyl peroxide, or where denatured alcohol or other harsh ingredients are primary
• Store in a cool, dry place. Avoid eyes. External use only

Expected Shipping Date

Ships within 1-3 days

Frequently Asked Questions