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AA Barrier Serum by Algenist

30ml | SKU# UK200024801

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Defend the complexion from pollutants and damage caused by the environment with the Algenist AA Barrier Serum, an antioxidant serum that features a fast-absorbing formula.

This treatment has been developed with the brand’s patented anti-ageing ingredient, Alguronic Acid, an effective compound sourced from algae cells. It also contains nourishing vitamin B3 along with a powerful antioxidant blend that includes ergothioneine from mushrooms and phloretin from apples. These actives work together to provide a defence against urban pollution and improve the skin’s overall appearance. With continued use, it can help to reduce the appearance of fine lines, dullness and discolouration.

Algenist AA Barrier Serum can be used after cleansing and toning. Smooth a little onto the face, neck and upper chest before applying a moisturiser.

Formulated to strengthen the skin, the Algenist AA Barrier Serum is packed with antioxidants and works to provide protection against environmental aggressors.
Key Benefits:
  • Provides antioxidant protection
  • Acts to fortify the skin’s natural defences
  • Evens out the skin tone and combats dullness
  • Minimises the appearance of fine lines, wrinkles and redness
  • Contains the brand’s patented anti-ageing ingredient, Alguronic Acid

Free on all orders over £40
Delivery within 2-4 working days.* (Please note, during Sale periods and promotional offers this may take up to 7 working days).

Free when you spend £100
Order before 8pm Monday - Friday, and receive your order the next working day. Orders placed over the weekend or on UK Bank Holidays will be processed the next working day**

Free when you spend £40
Receive your order in 5-7 working days to European countries.

Free when you spend £40
Receive your order in 7-11 working days to the United States

Receive your order in 1-2 working days to the United States

Free when you spend £40
Receive your order in 7-14 working days to rest of world countries.

If you'd like to send your order as a gift, we can add a beautiful finishing touch with our gift wrap. Choose complimentary gift wrap at checkout.

About Algenist
The go-to brand for skincare grounded in science, it delivers intensive anti-ageing by harnessing the regenerative ability of nutrient-rich microalgae.
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What other customers think
AA Barrier Serum is rated 3.3 out of 5 by 114.
Rated 3 out of 5 by from Just ok I love Algenist and I was looking for changing up my skin care routine - I have been using vitamin c for years, to the point where I think I’ve maxed out on its benefits, so using this serum sounded like something new to try and to replace vitamin c as my serum. Unfortunately, though, it just doesn’t seem to do much! I don’t mind the smell that others have mentioned - it’s a strange smell but dissipates quickly - and another positive aspect is that it absorbs quickly and leaves my skin smooth under my other products. But that’s about it; I haven’t seen any noticeable benefits. It’s great if it’s actually pollution-blocking, and hopefully the ingredients are making my skin healthier, but I’d also like to see an impact on my skin as well. I won’t repurchase after I finish this bottle.
Date published: 2021-04-07
Rated 3 out of 5 by from Slightly unpleasant fragrance I generally love Algenist products - especially the marine range - so when I got this as a sample size I was keen to try it. First impressions weren’t great as I found it has a slightly unpleasant fragrance. The texture is fine - lightweight and absorbs fairly quickly and it easily allows the addition of a top moisturiser without dragging. The smell doesn’t last that long but I don’t think the results are worth the purchase price either.
Date published: 2021-04-05
Rated 3 out of 5 by from Fine, didn't go above and beyond I tried a sample of this serum and although it didn't aggravate my skin or break me out like some other users have reported, I can't say it did much to improve the overall appearance. I was concerned about the smell others reported (I'd say it's like the inside of a car with material seats that's got hot in the sun), but to be fair after it was applied it dissipated pretty quickly. Not enough of a difference to be worth putting up with though.
Date published: 2021-01-22
Rated 3 out of 5 by from Average I received a 8ml bottle of this in one of the gift with purchase deals a while ago and last ed a few weeks The texture of this is very nice and light weight and absorbed in very well in my skin, it did not break me out and did not irritate my skin. It has some really great ingredients and claims to it, which made me really want to love this, but found it to be very average. It sat well under my SPF and like that it protect against environmental aggressors. However like many have mentioned it does have a smell to it. It does smell like a mixture of hand sanitiser/ alcohol with a slight hint of sweetness to it, not the nicest smell but does disappear once you apply your moisturiser on top. Overall an average serum
Date published: 2021-01-16
Rated 1 out of 5 by from What is that smell.... I don't think i've ever thrown a sample bottle away of something as I always give them ago and hate to waste, but this little bottle I 'accidentally' left at my in laws. Couldn't even bring myself to put in in my bag to come home it smelled that bad - fair enough if it was a smell of bananas and you dont like bananas but this was a smell of wacky chemicals and i cant imagine that anyone would like that?!
Date published: 2020-10-28
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