The Knowledge Hub
Every HYYGIA read, organized in one place.
The most important step in any skin or hair routine happens before a single product is applied — it is the water itself. Browse the full library: blog posts, product guides, the science behind our filters, and tools to understand your local water.
Blog
Deep reads from the HYYGIA Journal
Peer-reviewed science, practical hair and skin guidance, and the stories behind the filters — published when we have something worth saying.
HYYGIA Journal — All Posts
Every article we publish: hard water science, hair care routines, skin barrier research, and product deep-dives. Start here for the full archive.
Jun 2025
Vitamin C Shower Filter: What It Does for Curly Hair
How ascorbic acid neutralizes chlorine on contact and what that means for moisture retention, curl definition, and scalp health.
May 2025
Hard Water and Hair Damage
Dissolved calcium and magnesium coat the hair cuticle, raise the pH, and cause breakage — explained with peer-reviewed references.
Apr 2025
Chlorine and Scalp Health
Why municipal chlorine disrupts the scalp microbiome, strips the lipid barrier, and how a Vitamin C filter addresses it at the source.
Mar 2025
Hard Water and Skin Irritation
The link between high-mineral water, eczema flares, and transepidermal water loss — and what the dermatology literature says about filtration.
Products
The HYYGIA filter lineup
Three filters, one mission — remove chlorine, chloramine, and dissolved minerals before the water touches your hair or skin.
All HYYGIA Products
The complete HYYGIA lineup — Vitamin C shower filters for every install type. Compare features, specs, and find the right filter for your shower.
Vitamin C Shower Filter
Our flagship three-layer cartridge: Vitamin C + KDF-55 + five live probiotic strains. 60-second install, ships free in the US.
Travel Shower Filter
Compact and portable — the same Vitamin C filtration in a form that packs into any bag. Perfect for hotels, gyms, and Airbnbs.
Pet Shower Filter
Dechlorinated water for bath time. Gentler on coats, skin, and eyes — the same technology scaled for your pet's shower attachment.
Science & FAQ
The research behind the results
Chemistry, dermatology, and microbiology — explained without jargon. Every claim is traceable to a source.
Why HYYGIA — The Science
Hard water chemistry, Vitamin C electron donation, KDF-55 redox, and five probiotic strains — the full mechanism with peer-reviewed citations.
Chlorine & Skin
A focused deep-dive on how chlorine and chloramine affect the skin barrier, dermal microbiome, and how filtration changes the equation.
Frequently Asked Questions
Hard water, curly hair, install cadence, probiotics, jojoba, cartridge lifespan, and pricing — answered plainly in one place.
Hard Water 101
The definitive HYYGIA primer: what hard water is, how minerals and oxidizers damage hair and skin, and what the science recommends.
Tools
Know your water before you filter it
Water Checker
Enter your zip code and find out how hard your local water is — mineral load, chlorine levels, and a personalized filter recommendation.
Ready to upgrade your shower?
Vitamin C neutralizes chlorine and chloramine on contact. Five live probiotic strains reset the showerhead microbiome. Cold-pressed jojoba restores the lipid barrier your skin loses every shower. 60-second install. Ships free in the US.