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 on all orders over £70*
Order before 1pm, and receive your order the next working day.**

Order before midday (Monday to Friday only) and receive your order by 6pm the same day. Only available for central London postcodes (check the map here).

Order before midday and collect your order for free from your chosen store in 2-5 days.
Read more about our Click & Collect service.
Click and Collect orders can not include Pre/Back order items, these must be ordered separately.

Delivered instantly by email, Free Delivery

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.

*This option is available for all UK Mainland addresses, excluding the Scottish Highlands and other parts of Scotland.

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 108.
Rated 1 out of 5 by from Awful product I usually like this brand but the AA barrier serum is definitely one to avoid. It smells so bad and you can get better quality products from cheaper brands. My first negative thoughts about a product but it’s awful! I may as bought a product from a second hand market. It’s hard to explain how bad it is!
Date published: 2020-10-21
Rated 2 out of 5 by from Very odd aroma I do generally like Algenist – have tried a fair few of their products now. Having said that, unfortunately this serum just doesn’t cut it for me. The texture’s alright – thick enough (I don’t like thin, runny ones) and it absorbs well. But the aroma – what is that?? Oh so very artificial, chemical in nature – not at all pleasant. Not for me.
Date published: 2020-10-14
Rated 3 out of 5 by from Average I tried this product following receipt of a generous sample size in a recent beauty gift. Overall I enjoyed using the serum; it wasn't sticky, absorbed without leaving a residue and had no unpleasant fragrance. However, I did not see much in terms of results. I found it a bit average.
Date published: 2020-10-03
Rated 1 out of 5 by from Brought me out in a horrible rash I received a small bottle of this in the spacenk beauty box. It does have a very chemical smell and a texture that lacks any sense of luxury. I applied to my décolleté and, despite having skin that hasn’t reacted to anything before, broke out in a red rash. Really disappointing from such a high ticket item.
Date published: 2020-09-25
Rated 3 out of 5 by from Not my favourite serum! I received a decent sample of this in a recent special gift pack which has lasted a couple of weeks. I’ve not noticed enough of a difference in my skin to justify purchasing the full size, particularly because I didn’t like the smell - like other reviewers, it does smell and feel like putting hand sanitiser on your face!
Date published: 2020-09-18
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