Heliocare 360 AK Fluid SPF100+ Review

Heliocare 360 AK Fluid SPF100+ is the highest-protection sunscreen in the Heliocare 360 fluid range, formulated with SPF100+ and PA++++ for very sun-sensitive or high-risk skin. It uses Fernblock, Heliocare's signature antioxidant derived from Polypodium leucotomos, in a lightweight fluid texture that absorbs quickly and leaves no white cast.

What is Heliocare 360 AK Fluid SPF100+?

It's part of Heliocare's 360 fluid line-up, sitting alongside the Age Active Fluid SPF50 and Pigment Solution Fluid SPF50+. Where those two combine sun protection with an anti-ageing or pigment-targeting focus, the AK Fluid is built around one thing: the very highest level of broad-spectrum protection Heliocare offers, at SPF100+ with a PA++++ rating against UVA. According to Heliocare's product information, the formula also defends against visible light and infrared-A radiation, alongside the UVA and UVB wavelengths SPF ratings measure.

The product comes in a 50ml bottle with a fluid, lotion-like consistency rather than a thick cream, which is typical of the 360 fluid sub-range. It's positioned by Heliocare as the option for people who want the ceiling on SPF without moving to a different texture family within the range — you're not trading the fluid feel for a heavier cream to get to SPF100+.

SPF100+ and PA++++: what the numbers actually mean

SPF measures protection against UVB, the wavelength mainly responsible for sunburn. The jump from SPF50 to SPF100 filters a smaller extra percentage of UVB than the doubled number suggests, because both are already filtering the vast majority of UVB radiation. The real-world benefit of a higher SPF is margin: most people apply far less sunscreen than the amount used in official SPF testing, so a higher-rated product gives more headroom before protection drops meaningfully below the number on the bottle.

PA is a separate scale that rates UVA protection, running from PA+ to PA++++. UVA penetrates deeper into the skin and is linked to premature ageing and longer-term skin damage, and isn't measured by the SPF number at all. A PA++++ rating, as Heliocare states for this formula, is the top of that scale, meaning the product is rated for very high UVA protection alongside its SPF100+ UVB rating.

Key ingredients: Fernblock and antioxidant support

The core active technology is Fernblock, Heliocare's proprietary antioxidant extract from the fern Polypodium leucotomos, present across the brand's 360 range. Per Heliocare's product description, Fernblock is included here to help neutralise free radicals generated by UV and environmental exposure, working alongside the sunscreen filters rather than replacing them. The brand also references a “GenoRepair Complex” within this formula, which it positions as supporting the skin's natural repair processes after sun exposure.

We haven't independently verified percentage concentrations or specific clinical claims tied to these technologies, so we're reporting them as Heliocare describes them rather than adding our own figures. We also don't have the full INCI ingredients list to hand for this page, so if you have a specific allergy or sensitivity, check the packaging or product listing directly before buying, or ask our team.

Texture and finish

Heliocare describes the AK Fluid as a silky, lightweight fluid that absorbs rapidly with a barely-there finish, sitting comfortably under makeup or worn alone. It's formulated to avoid a greasy or white-cast finish, which is a common request from people who find very high SPF sunscreens heavy or difficult to layer under other products. Because we haven't tested it ourselves in the Skintique Academy studio, treat texture descriptions here as sourced from the brand rather than an independent hands-on review.

Who this fluid suits

• Anyone wanting the very highest SPF available in the Heliocare 360 range (SPF100+ vs SPF50/SPF50+ elsewhere in the line)
• Fair or very sun-sensitive skin that burns easily with limited exposure
• People who want a lightweight, fast-absorbing fluid rather than a cream or gel texture
• Those already using a dedicated pigmentation or anti-ageing product and who want maximum protection layered on top, rather than a multi-tasking SPF
• Anyone who travels to high-UV destinations, spends long periods outdoors, or lives at altitude, where the margin a higher SPF provides is more likely to matter
• People who've found other sunscreens either too heavy to wear daily or not protective enough for how their skin reacts to sun exposure

It's less likely to be the right pick if you specifically want an SPF that also targets pigmentation or fine lines as a secondary benefit — for that, the Pigment Solution Fluid or Age Active Fluid are built with those goals in mind, at SPF50+ and SPF50 respectively rather than SPF100+.

If you're being treated for a specific skin condition, are under dermatological care, or have any concerns about sun sensitivity linked to medication or a diagnosed condition, speak to your dermatologist or GP about which SPF level and formula is right for you before choosing a product based on marketing alone.

How to use it

Apply as the final step of your morning skincare routine, in this order:

• Cleanse
• Any treatment serums (vitamin C, pigment-targeting actives, and so on)
• Moisturiser
• Heliocare 360 AK Fluid SPF100+, applied generously as the last step
• Makeup, if worn, applied on top once the fluid has absorbed

As with any sunscreen, a high labelled SPF only delivers that level of protection when applied generously and reapplied through the day if you're outdoors for extended periods, sweating, or swimming. A widely used guide is roughly a teaspoon-sized amount for the face and neck, though this varies by face shape and how much is being covered. No SPF, regardless of rating, replaces shade, protective clothing, or avoiding peak sun hours between roughly 11am and 3pm in the UK summer.

Heliocare 360 AK Fluid vs the rest of the fluid range

All three fluids share the same lightweight, fast-absorbing texture and Fernblock antioxidant base, but they're built for slightly different priorities.

If tone or fine lines are part of what you want your SPF to help with, the Age Active Fluid or Pigment Solution Fluid are worth comparing before you commit to the AK Fluid, since neither reaches SPF100+ but both add a secondary skin-focused ingredient set. If you'd rather keep your SPF and your treatment products completely separate and just want the ceiling on protection, the AK Fluid is the more straightforward pick.

For a texture comparison, the Heliocare 360 Gel Oil-Free SPF50 is worth a look too. It's a different format again — an oil-free gel rather than a fluid — for anyone who finds fluids still feel too rich.

Where it sits in a wider routine

SPF should be the last step of any morning routine, applied over active ingredients rather than mixed with them. If pigmentation is your main concern, this fluid can sit alongside (not instead of) a dedicated pigmentation routine — see our guide to the best pigmentation products for how SPF fits into that bigger picture. If broad vitamin C or antioxidant serums are more your focus, our vitamin C serum guide covers that territory separately, since general vitamin C intent is covered there rather than duplicated on Heliocare-specific pages.

Common questions

Is SPF100+ meaningfully different from SPF50? The gap in filtered UVB radiation between SPF50 and SPF100 is smaller in percentage terms than the numbers suggest, but a higher SPF gives more margin for the under-application that happens in real-world use, which is one reason very-high-SPF formulas exist for sun-sensitive skin.

Can I wear this under makeup? Heliocare describes the finish as suited to wearing under makeup thanks to its lightweight, fast-absorbing texture; we haven't tested this ourselves, so treat it as a brand claim rather than an independently verified one.

Is it reef-safe or suitable for sensitive skin? We don't have Heliocare's specific reef-safety or sensitivity-testing claims for this formula to hand, so we've logged that as a data gap rather than guessing. If you have known sensitivities, patch test first or check with our team.