Medik8 Hydr8 B5 serum bottle stands against a clean white background with a clear liquid puddle and droplets, with the dropper resting on top. Text identifies the product as a 30mL "Liquid Rehydration Serum."
Medik8 Hydr8 B5 serum bottle stands on a white pedestal against a bright white background. Text highlights that the product "Delivers long-lasting skin hydration," "Helps the skin retain essential moisture," "Softens the look of fine lines & wrinkles," and "Promotes a visibly plump & supple complexion."
A close-up of the Medik8 Hydr8 B5 serum bottle and dropper with clear liquid. Text highlights key ingredients: "MULTI-WEIGHT HYALURONIC ACID Leaves the skin visibly hydrated & supple" and "VITAMIN B5 Helps the skin retain & regenerate moisture for a plumper appearance."
Medik8 Hydr8 B5 Intense and Hydr8 B5 serum bottles stand on white pedestals against a clean, bright background. Text lists benefits for "HYDR8 B5 INTENSE" as "For supercharged, long-lasting hydration" and "Ideal for normal to dehydrated skin types." Benefits for "HYDR8 B5" include "For lightweight daily hydration" and "Ideal for normal to sensitive skin types."
An infographic titled “HOW TO LAYER” displays a step-by-step Medik8 skincare routine for AM and PM against a clean grey and white background. Sun and moon icons indicate the time of use. The Medik8 Hydr8 B5 bottle is highlighted in dashed boxes under the “HYDRATE” step for both routines. Other steps include "CLEANSE," "VITAMIN C," "SUNSCREEN," "VITAMIN A," and "MOISTURISE."
Medik8 Hydr8 B5 serum bottle stands in front of its matching white product carton on a clean white background. Text on both identifies the product as a 30mL "Liquid Rehydration Serum."
Medik8 Hydr8 B5 travel-sized serum bottle stands next to its matching white product carton on a grey textured surface against a neutral background. Text on the 8mL bottle identifies it as a "Liquid Rehydration Serum."
Medik8 Hydr8 B5 serum bottle stands against a clean white background with a clear liquid puddle and droplets, with the dropper resting on top. Text identifies the product as a 30mL "Liquid Rehydration Serum."
Medik8 Hydr8 B5 serum bottle stands on a white pedestal against a bright white background. Text highlights that the product "Delivers long-lasting skin hydration," "Helps the skin retain essential moisture," "Softens the look of fine lines & wrinkles," and "Promotes a visibly plump & supple complexion."
A close-up of the Medik8 Hydr8 B5 serum bottle and dropper with clear liquid. Text highlights key ingredients: "MULTI-WEIGHT HYALURONIC ACID Leaves the skin visibly hydrated & supple" and "VITAMIN B5 Helps the skin retain & regenerate moisture for a plumper appearance."
Medik8 Hydr8 B5 Intense and Hydr8 B5 serum bottles stand on white pedestals against a clean, bright background. Text lists benefits for "HYDR8 B5 INTENSE" as "For supercharged, long-lasting hydration" and "Ideal for normal to dehydrated skin types." Benefits for "HYDR8 B5" include "For lightweight daily hydration" and "Ideal for normal to sensitive skin types."
An infographic titled “HOW TO LAYER” displays a step-by-step Medik8 skincare routine for AM and PM against a clean grey and white background. Sun and moon icons indicate the time of use. The Medik8 Hydr8 B5 bottle is highlighted in dashed boxes under the “HYDRATE” step for both routines. Other steps include "CLEANSE," "VITAMIN C," "SUNSCREEN," "VITAMIN A," and "MOISTURISE."
Medik8 Hydr8 B5 serum bottle stands in front of its matching white product carton on a clean white background. Text on both identifies the product as a 30mL "Liquid Rehydration Serum."
Medik8 Hydr8 B5 travel-sized serum bottle stands next to its matching white product carton on a grey textured surface against a neutral background. Text on the 8mL bottle identifies it as a "Liquid Rehydration Serum."
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Dry & dehydrated skin

Hydr8 B5™

  • Hydrate
  • |
  • Plump
  • |
  • Smooth
Liquid Rehydration Serum

Infuse your skin with long-lasting hydration with Hydr8 B5.

Medik8's original hyaluronic acid serum floods multiple layers of the skin with multi-weight hyaluronic acid to leave it visibly plumped and supple, while effortlessly softening the look of fine lines.

Proven to leave the skin feeling more hydrated in 7 days, this lightweight, oil-free serum absorbs quickly for fast visible results that won't leave the complexion feeling greasy.*

Instead, it works to improve the skin's moisture retention and regeneration abilities for a cushion-soft, intensely hydrated and visibly replenished complexion.
Select a Size
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Reasons to shop Medik8

Free UK delivery over £25
15% off your first order
"No questions asked" easy 30 day returns
Medik8 Advanced Night Restore cream jar shown open with a rich dollop of white cream peaked on top against a clean white background, highlighting its smooth, restorative texture. Black text on the jar reads "Rejuvenating Multi-Ceramide Night Cream".
Advanced Night Restore™
  • Smooth
  • |
  • Nourish
  • |
  • Firm
 Rejuvenating Multi-Ceramide Night Cream
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View our verified proof
Sustainability

Provenance provides confidence for sustainability claims; helping to prevent 'green-washing' and empowering conscious consumers to purchase in line with their values. Provenance 'Proof Points' are all third party verified and evidenced through supply chains.

Product proof points

The Vegan Trademark

Certified to contain no animal products or byproducts and has not been tested on animals.

Partly Recyclable Packaging

Recyclable Parts: Bottle (glass) and Container (cardboard) Non-Recyclable Parts: Pipette

Brand proof points

B Corporation

Medik8 is a certified B Corporation, scoring over 80 out of 200 across Governance, Workers, Community, Environment and Customers. The certification includes a legal commitment to consider all stakeholders in decision-making. Verified every three years.

SBTi Approved Targets

Medik8 has SBTi approved science-based targets to reduce greenhouse gas emissions in line with limiting global warming to 1.5°C or well-below 2°C. Progress is reported publicly every year, with targets validated by the certifier and reviewed every 5 years.

Living Wage Employer

Medik8 is a Living Wage Employer — all staff are paid a wage calculated to meet the cost of living in the UK. Company wages are updated annually after new rates are announced by the Living Wage Foundation.

Donates to Charity

In 2022 Medik8 donated £10,000 to the National Society for the Prevention of Cruelty to Children

Carbon Measured

The footprint was calculated using GHG Protocol methodology; GWP 100.

Renewable Energy

Medik8's Innovation Centre uses electricity from 100% renewable sources.

Made in Britain

Medik8 carries the Made in Britain trademark — manufactured in the United Kingdom. Subject to facility verification and annual renewal.

Powered by Provenance
Key Benefits
Long-Lasting Hydration Boost

Immediately floods the skin with moisture while boosting its natural moisture retention and regeneration abilities for even longer-lasting hydration.

Oil-Free Moisture Replenishment

This lightweight formula leaves skin replenished without clogging your pores. Ideal for normal to sensitive skin types.

Plumping & Smoothing Effect

Effortlessly smooths the look of fine lines and wrinkles while promoting a plumper, more supple-looking complexion.

Proven Results
Instantly leaves skin feeling quenched*
Instantly leaves skin feeling more comfortable*
7 days to leave skin feeling more hydrated*
86% agree their skin looks more plump after 4 weeks*
98% agree formula layered well under makeup*
*Proven via independent consumer study on Hydr8 B5 conducted over 4 weeks on 57 participants. | Please Note: Product packaging shown may be different to the product received due to regional variations.
How to Use

First-time use

If you're new to Hydr8 B5, we recommend a patch test at least 24 hours before first use. Learn how to patch test here.


Step 1

After cleansing in the morning and evening, massage 6 drops of Hydr8 B5 across the face, neck and décolletage.


Step 2

Leave to absorb before applying moisturiser.

Uses per bottle

90
Guide to Layering
Step 1: Cleanse
Medik8 Micellar Mousse pump bottle displayed on a white background with a smear of white foam behind it, highlighting the product's texture.
Morning
Evening
Micellar Mousse™
Full Size (150ml)
Step 2: Tone
Medik8 Press & Glow tonic bottle stands against a clean white background with translucent liquid droplets and a puddle, highlighting its watery texture. Text identifies the product as a 200mL
Morning
Evening
Press & Glow®
Select a Size
Step 3: Target
Medik8 Hydr8 B5 serum bottle stands against a clean white background with a clear liquid puddle and droplets, with the dropper resting on top. Text identifies the product as a 30mL
Morning
Evening
Hydr8 B5™
Select a Size
Step 4: Renew
Crystal Retinal®
Evening
Crystal Retinal®
Select a Strength
Step 5: Moisturise
An open frosted glass jar of Medik8 Total Moisture Daily Facial Cream with a peak of white cream on top, set against a clean white background. Badges in the top corners indicate it is a
Morning
Evening
Total Moisture Daily Facial Cream™
Select a Size
Key Ingredients
Multi-Weight Hyaluronic Acid

Unlike many other hyaluronic acid serums, Hydr8 B5 uses multiple molecular weights of hyaluronic acid (small, medium and large), to distribute deep hydration evenly throughout the skin's many layers. This leaves the complexion visibly nourished and supple.

Vitamin B5

Also known as panthenol, vitamin B5 helps the skin to retain moisture, while supporting the regeneration of skin cells for visibly plumper skin.

Full List of Ingredients
Hydr8 B5™
Liquid Rehydration Serum

Aqua (Water), Panthenol, Sodium Hyaluronate, Calcium Pantothenate, Phenoxyethanol, Ethylhexylglycerin, Citric Acid.

*Although we try our best to ensure this list of ingredients is accurate there may be product upgrades from time to time, or slight variants between different regions based on local laws, meaning the only definitive ingredient list is that which is printed on the product packaging.
  • Fragrance free
  • No synthetic colours
  • Paraben free
  • Alcohol free
  • Certified by the vegan society
Experts Recommended

"An oil-free solution for soft & supple skin."

DANIEL ISAACS
Chief Product Officer
A circular headshot portrait of a man with light brown hair and green eyes, smiling neutrally. He is wearing a white lab coat with 'Medik8' embroidered on the pocket and a black button-up shirt. The background is white.

"This cult classic drenches the skin with moisture!"

EMMA STODDART
Beauty Contributor - Grazia

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Reviews

Frequently Asked Questions

What's the difference between Hydr8 B5 and Hydr8 B5 Intense?

Hydr8 B5 is our original, bestselling hyaluronic acid serum. Hydr8 B5 Intense is our supercharged version, fortified with superfood antioxidants and Natural Moisturising Factors for heightened hydration power.

Can I use Hydr8 B5 while pregnant or breastfeeding?
As a cosmetics company, we are unable to provide product advice in relation to medical conditions such as pregnancy. We would recommend discussing the ingredients with your GP or midwife before use. As general guidance, this product does not contain any ingredients which we would recommend to avoid during pregnancy, unless advised by your doctor.
Should I use Hydr8 B5 in the morning or evening?
Both! Hydr8 B5 can be applied after cleansing, both morning and evening, to give the skin a hydration boost.
Can I use Hydr8 B5 alongside Crystal Retinal? And if so, how?
After cleansing in the evening, apply Hydr8 B5 followed by Crystal Retinal for enhanced skin-firming results.
Should I use Hydr8 B5 or Hydr8 B5 Intense if I have sensitive skin?
We usually recommend Hydr8 B5 for maintaining daily hydration in normal or sensitive skin types. Hydr8 B5 Intense is for dehydrated skin in need of a more intense hydration boost. Both are suitable for sensitive skin.
Hydr8 B5™
Full Size (30ml)
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