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AA Barrier Serum

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 2pm, and receive your order the next working day.**

Order before 2pm, and receive your order on the morning of 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 2pm on the preceding Friday, and receive your order before 12pm the following Saturday.**

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 3.5 out of 5 by 89.
Rated 3 out of 5 by from The smell? I received this as a sample. I’ve bought Algenist products in the past and some of my favourite, staple products are Algenist, so I was pleased to have the opportunity to try this. Well, What can I say? It’s not the most visually attractive product to apply! And the smell is just bizarre; it has an odour like a broken air con system, like damp. But, if you can get past all this (the smell doesn’t last), the serum sinks into the skin beautifully and the skin does look refreshed and hydrated after use. I’d have to trial the product for longer in order to comment on long-term effects. The three stars is for the odour issue.
Date published: 2020-05-12
Rated 4 out of 5 by from good I had a sample of this serum and really liked it. BUT I also really love my vitamin c serum in the mornings and this wasn't good enough to replace that. If I lived in the city then maybe I would as it is meant to be good to protect against the environment.
Date published: 2020-05-12
Rated 1 out of 5 by from Sorry but... Really Algenist Alguronic Acid + Phloretin AA Barrier Serum could be so good. It does a fab job as a serum, goes on beautifully, and leaves just the right feeling on my skin, but but but!!!!!!!! the smell... it reminds me of a Y7 Chemistry lesson... not good.
Date published: 2020-05-07
Rated 2 out of 5 by from Nice but not the best Have been using a sample of this product of like 8 ml every morning for like a month. I like the effect it has on my skin, seems to be making my skin stronger, more resilient and happier. The only downside is the smell, I really did not like that. Other products of this range I liked more.
Date published: 2020-05-02
Rated 4 out of 5 by from Weird smell, nice texture! This has a weird, almost medicinal smell to it, a bit like cleaning product! But it fades quickly and I really like the texture-nice and light and goes well under moisturiser. I’m tempted to repurchase (I had a sample which lasted around 3 weeks) but it’s pricey!
Date published: 2020-04-30
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