Medik8 Hydr8 B5 Review: Hyaluronic Acid Serum
The Verdict
Hydr8 B5 does one job — daily hydration — and does it without fragrance, oil or unnecessary complexity. A sensible, easy-to-layer pick for anyone wanting a straightforward hyaluronic acid and vitamin B5 serum; compare against Hydr8 B5 Intense if your skin regularly feels tight or dull.
Medik8 Hydr8 B5 | Hyaluronic Acid Serum | 30ml
£45.00
Medik8 Hydr8 B5 is a lightweight, oil-free serum built around multi-weight hyaluronic acid and vitamin B5 (panthenol), designed to help improve the skin's appearance of hydration and plumpness. Fragrance-free and formulated for all skin types, including sensitive skin, it's Medik8's original hyaluronic acid serum and layers easily under moisturiser as a daily hydration step, morning and evening.
What is Medik8 Hydr8 B5?
Hydr8 B5 is a serum from Medik8's hydration range, formulated around two core ingredients: hyaluronic acid, used here at multiple molecular weights, and vitamin B5 (panthenol), an ingredient widely used in skincare to support the skin's moisture retention. The formula is crystal-clear, oil-free and fragrance-free, and it's positioned as an everyday hydration step rather than a targeted treatment serum.
The idea behind using hyaluronic acid at several molecular weights is straightforward: smaller molecules are able to sit within the upper layers of skin, while larger molecules stay closer to the surface. Used together, the aim is more even coverage across the skin's outer layers rather than hydration concentrated in one spot. This is a widely documented property of hyaluronic acid as an ingredient rather than a claim specific to this formula.
Quick facts
| Detail | Hydr8 B5 |
|---|---|
| Brand | Medik8 |
| Product type | Serum |
| Format | 30ml pump bottle |
| Key ingredients | Multi-weight hyaluronic acid, vitamin B5 (panthenol) |
| Texture | Crystal-clear, lightweight, fast-absorbing |
| Fragrance | Fragrance-free |
| Oil content | Oil-free |
| Skin types | All skin types, including sensitive |
| Suggested use | Morning and evening, before moisturiser |
| Price band | Mid-to-premium — see current price on the product page |
Key ingredients
Multi-weight hyaluronic acid
Hyaluronic acid is a naturally occurring humectant already present in skin, where it plays a role in helping the skin hold onto water. As an ingredient, it's valued in skincare for its capacity to attract and hold moisture — a well-established property of the molecule itself, not something specific to this formula. Medik8 uses several molecular weights of hyaluronic acid in Hydr8 B5, rather than a single weight, with the aim of layering hydration across different depths of the skin's outer layers.
Vitamin B5 (panthenol)
Panthenol, the form of vitamin B5 used in skincare, is a well-known humectant and skin-conditioning ingredient. It's commonly included in hydrating formulas alongside hyaluronic acid to help support the skin's moisture barrier and improve the appearance of smoothness.
Texture and how it feels
Hydr8 B5 has a thin, watery, crystal-clear texture typical of hyaluronic acid serums. It sinks in within seconds and doesn't leave a sticky or greasy residue, which is why it's positioned as suitable for oilier skin types as well as dry or sensitive skin. Because it's oil-free, it sits well underneath heavier creams, SPF or makeup without pilling.
Who is it suitable for?
- Anyone looking for a lightweight, everyday hydration step to add underneath moisturiser
- Normal, combination and oily skin types wanting hydration without added richness
- Dry or dehydrated skin that needs a humectant layer before a heavier cream
- Sensitive skin, given the fragrance-free and oil-free formulation
- Those newer to hyaluronic acid serums who want a straightforward, single-purpose product
Hydr8 B5 vs Hydr8 B5 Intense
Medik8 also sells a richer version of this serum, Hydr8 B5 Intense, which adds Natural Moisturising Factors and saskatoon berry extract to the same multi-weight hyaluronic acid and vitamin B5 base. The two are easy to mix up, so here's how they differ on formulation:
| Feature | Hydr8 B5 | Hydr8 B5 Intense |
|---|---|---|
| Core hydrators | Multi-weight hyaluronic acid, vitamin B5 | Multi-weight hyaluronic acid, vitamin B5, Natural Moisturising Factors, saskatoon berry |
| Appearance | Crystal-clear | Naturally tinted (purple-red, from saskatoon berry) |
| Positioning | Everyday hydration maintenance | More intensive hydration step |
| Price band | Mid-to-premium | Premium |
If you're deciding between the two, treat standard Hydr8 B5 as the daily-driver option, and Intense as the step up for skin that regularly feels tight, dry or dull. Full pricing and stock for both sit on their respective product pages.
How to use Hydr8 B5
- Cleanse and, if used, apply your toner or exfoliating step first.
- Apply Hydr8 B5 to damp skin — hyaluronic acid works best when there's already some moisture for it to bind to.
- Follow with a moisturiser to help lock the hydration in; hyaluronic acid serums applied to dry skin without a follow-up cream can, in low-humidity conditions, draw moisture from the skin rather than the air.
- Can be used morning and evening as part of a daily routine, and layers under SPF and makeup once fully absorbed.
If you're pregnant or breastfeeding
If you're pregnant or breastfeeding, please contact our team for advice before use.
Verdict
Hydr8 B5 does one job — daily hydration — and does it without fragrance, oil or unnecessary complexity, which is exactly why it's remained a mainstay of Medik8's range. It's a sensible pick if you want a straightforward hyaluronic acid and vitamin B5 serum to layer into an existing routine, rather than a heavier or actively-tinted treatment. If your skin regularly feels tight or dull, it's worth comparing against Hydr8 B5 Intense before you buy.
Frequently asked questions
Is Medik8 Hydr8 B5 suitable for sensitive skin?
The formula is fragrance-free and oil-free, which is generally a good starting point for sensitive skin. As with any new product, we'd recommend patch-testing on a small area first, and getting in touch with our team if you have specific skin concerns you'd like advice on.
Can I use Hydr8 B5 with retinol or vitamin C?
Hyaluronic acid serums are generally easy to layer with other actives because they're primarily hydrating rather than exfoliating or active in the way retinoids or vitamin C are. Many people apply Hydr8 B5 either before or after these steps to help offset any dryness. If you're unsure how to build this into your specific routine, our team can talk you through it.
Does Hydr8 B5 help with acne or rosacea?
Hydr8 B5 is formulated as a general hydration serum rather than a treatment for a specific skin condition. If you're managing acne, rosacea or another skin concern, we'd recommend speaking with our team, who can help you think through where a hydrating serum like this might fit alongside any condition-specific products or advice.
What's the difference between Hydr8 B5 and Hydr8 B5 Intense?
Both use multi-weight hyaluronic acid and vitamin B5. Intense adds Natural Moisturising Factors and saskatoon berry extract, has a naturally tinted appearance, and is positioned for more intensive hydration needs. Standard Hydr8 B5 is the lighter, everyday option. See the comparison table above for a fuller breakdown.
Is Hydr8 B5 safe to use during pregnancy or breastfeeding?
If you're pregnant or breastfeeding, please contact our team for advice before use.
How long does a 30ml bottle of Hydr8 B5 last?
This depends on how much you use per application and how often, and Medik8 doesn't publish an official usage estimate for this product. As a lightweight serum used in small amounts, a 30ml bottle typically covers several weeks of daily use, though individual usage will vary.