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Bk – Rejuvenation Eye Serum

Kakadu Plum

Rejuvenating serum containing high levels of vitamin C to diminish fine lines, pigmentation and redness. Can also be used on the face and body.

Rated 5.00 out of 5 based on 30 customer ratings
(30 customer reviews) View All
KaydeenJune 18 2019
I have tried so many products and have wasted so much money and so stoked to say I have truly invested in something so great with Biologi Serums. They have changed my life! I suffer from eczema, sensitive and dry skin and this has definitely helped during this winter season keeping my eye area hydrated. THANK YOU!

AUD$25.00 AUD$88.00 

or 4 fortnightly payments from AUD$6.25  with Afterpay





Why choose Bk serum?

Bk serum contains high levels of vitamin C to diminish fine lines and firm delicate skin.
Primarily designed as an eye serum, Bk serum can also be used as a full-face serum for anyone concerned with anti-ageing, pigmentation or redness.

Ingredients: Kakadu Plum, 0.2% Sodium Benzoate

Use Bk serum for:
  • Anti-ageing
  • Hydration
  • Reduce skin blemishes and redness
  • Anti-oxidant protection from damaging free radicals

Kakadu plum 100% active nutrients*

Plant-based natural vitamin C

The science
Vitamin C from a natural source increases the suppleness of skin, reduces fine lines and wrinkles, increases skin elasticity, inhibits melanogenesis and reduces dark circles and sunspots. The powerful active nutrient also helps skin combat damage from harmful UV rays.

Why do I need vitamin C?

  • Hydration
  • Anti-ageing
  • Skin brightening
  • Reduce sun spots, blemishes and dark circles
  • Anti-oxidant to protect from free radicals and environmental damage
Gallic acid

The science
Gallic acid is a phenolic acid that works as a potent anti-oxidant, reduces DNA damage, inhibits melanogenesis and improves inflammatory skin disorders.

Why do I need gallic acid?

  • Anti-ageing
  • Reduce sun spots and under eye dark circles
  • Anti-oxidant to protect from free radicals and environmental damage

Ellagic acid

The science
Another phenolic acid, ellagic acids helps in the treatment of chronic UV exposure, reduces the potential of photoaging, inhibits melanogenesis and reduces membrane liquid peroxidation and DNA damage.

Why do I need ellagic acid?

  • Sunburn
  • Anti-ageing
  • Reduces sun spots and dark under-eye circles
  • Brightens skin

*An active nutrient is a biological ingredient in the plant source that directly affects the function of the skin. All serums in the Biologi range re undiluted and contain active nutrients at 100%

How to use Bk serum:

  • Cleanse thoroughly and dab ½ a pump around the eye area after cleansing
  • To use as a full-face serum, apply one pump to the whole face and neck area after cleansing
  • Week one: apply every second night
  • Week two: apply every night
  • Ongoing: Use daily both morning and night


Frequently Asked Questions

Yes, if anti-ageing and pigmentation is a concern, your whole face will benefit from Bk serum. We recommend using the Bk all over the face a few nights a week for an added vitamin C boost.
You can use Bk serum to target the delicate eye area and Bd or Bf serum on your face. Be careful not to layer the serums as the actives from each extract work synergistically as they do in the plant so combining the actives could have a negative effect and your serums may not work as well.
Vitamin C is a natural active found in fruits such as oranges, lemons, finger lime (Bf serum) and Kakadu plum (Bk serum). Ascorbic acid is a synthetic product made by scientists in a lab. Vitamin C is notoriously unstable when exposed to air or water, and ascorbic acid adds synthetic stabilisers to vitamin C extracts, so it can be used in skincare products. Biologi serums are extracted using a revolutionary extraction method and so far, we are the only skincare company in the world who can provide consumers with plant based, natural, stable vitamin C.

30 reviews for Bk – Rejuvenation Eye Serum

  1. Rated 5 out of 5


    I have tried so many products and have wasted so much money and so stoked to say I have truly invested in something so great with Biologi Serums. They have changed my life! I suffer from eczema, sensitive and dry skin and this has definitely helped during this winter season keeping my eye area hydrated. THANK YOU!

  2. Rated 5 out of 5


    Remarkable! My under-eyes look amazing! Dark circles dramatically reduced, fine lines almost non-existent, pigmentation nearly gone & my whole face looking so much brighter & smoother! Alternating with the other serums on my whole face at night or just under the eyes daily. As a mid-30’s, mum of 3, I needed a simple & reliable skin care routine, purchased during the recent offer of a free travel set with any purchase & I am not disappointed, in fact I have since ordered the other 2 full size as I simply cannot go back now! Soooo worth the investment as only 1 pump is needed – just wash, dry & apply the serum 🙌🏻

  3. Rated 5 out of 5


    The biologi products are amazing. I have sensitive skin and rosacea. Neither has been a problem since using these serums. The eye serum in particular is great. I use it all over my face and is a great base for makeup (light powder). The serums have also been great for my teenage daughter’s acne prone skin. You can see it starting to heal the skin and her outbreaks have reduced significantly. To say we are relieved is an understatement.

  4. Rated 5 out of 5


    I am more than happy actually ecstatic after finding the eye serum. I have Sjögren’s syndrome and my eyes are very sensitive to everything under the sun. I have spend thousands of dollars looking for an eye cream/ serum which won’t irritate my eyes.
    Finally I found something I can honestly say is the best. I use the eye serum all over my face morning and night. Love how it feels and the glow it gives me. I apply foundation direct over the serum. No moisturiser needed.
    Thank you Biologi for an amazing product.

  5. Rated 5 out of 5


    I love Biologi. I have used hundreds of different products over the years to help with acne and this has had the greatest effect. I use this along with the Bd. But i felt that when I started using this one it helped a lot with reducing old spots. Will never use another brand again. It is a bit sticky and it does work slowly and i still do get the occasional breakout but they clear up quicker and my skin is just looking so much healthier.

  6. Rated 5 out of 5

    Donatella Parisini

    I tried so many hydrating creams and serums in the last 40 years … finally, the Biologi serums found me!
    It’s a year I’m using them all , in love with Biologi rejuvenating serum… my skin can’t live without them. Light and illuminating,
    Highly recommended.

  7. Rated 5 out of 5

    Daars Nadarajan

    In love with this product! I was a travel size as a gift but was skeptical that it will help reduce the acne scar on my face but after reading reviews I decided to give it a try. I have only been using it for a week but I woke up with brighter and plumper skin with just one use. I have been using it for about 10 days now and my scars have visibly reduced. I don’t use foundation any more! Cant wait to buy a whole set now!

  8. Rated 5 out of 5


    This product has totally transformed my skin. I no longer have puffy eyes with dark circles. My skin has never been so clear and even toned. And fine lines have all but disappeared.
    I wish I had known about this product sooner but am so happy I have it now. Thanks Biologi

  9. Rated 5 out of 5

    Kathryn Kwok

    Such a beautiful serum! Literally wake up glowing and looking more plump. Using the BD and BK has healed my acne. I will never use anything else 🙂

  10. Rated 5 out of 5

    Olivia Main

    As a mum I am always tired! But i find that other eye serums are oily and run into the eye, creating irritation! I find Biologi eye serum amazing, removes fine lines without turning my face into a shiny oily mess. With little kids, its vital that i use all natural products as they are constantly touching my face- this range ticks all of the boxes for me!

  11. Rated 5 out of 5


    After switching to all completely natural skincare, make up, hair care etc nearly 4 years ago I have tried quite a few different natural skincare brands in hopes it would clear my mild acne, acne scarring, uneven skin tone and redness. All pale in comparison to Biologi. The hydration is second to none, my skin looks luminous, clear and happy, finally!
    I use all 3 serums and alternate with my skins needs.
    Bk is excellent at night under the eyes or whole face if my skin needs a boost, definitely notice a difference in the darkness under the eye and reduced fine lines – at 36 I need that!
    It makes skin literally glow!
    Most times now I can add a little cream stick concealer and thats all I need, when I used to not leave the house without a full face of mineral powder foundation on,

    My partner commented on how great my skin looks and now steals it too!
    You guys are amazing!!

    Any chance you’ll produce a Cleanser & Exfoliant..?? 🙂

  12. Rated 5 out of 5


    I wasn’t sure if I really needed this product when I first started using biologi as I don’t really have any issues around or under my eyes BUT prevention is key .

    I have notice a difference in how dark the skin was under my eyes and I also use this over my whole face at night when my skin needs a little extra boost

  13. Rated 5 out of 5


    Surprisingly I have found this product to be most beneficial on cystic acne (as well as a great hydrating serum)! I apply this serum to my entire face under makeup for work and then on a clean face before bed and have found that almost instantly it starts to reduce inflammation, redness, size etc. I don’t have any dry skin or patchy areas like other zip zapping medications after use. Possibly I believe this serum is even helping to reduce the surface scars caused by cystic acne and at 32 years of age that is fantastic!

    Love it.

  14. Rated 5 out of 5


    I don’t have very deep lines around my eyes, but as I’m getting older (now mid 30s) my eye area was starting to look a bit more dehydrated. Makeup was starting sit in the fine lines around my eyes. I don’t have this problem anymore! Since using this serum my eye area is so plump and hydrated and now I have barely any signs of noticeable aging around my eyes. My makeup looks much better too 🙂 thanks Biologi ❤️

  15. Rated 5 out of 5

    Michelle Davidson

    So pleased to have come across this amazing product with age and sun the lines around the eyes were showing, not great! Now I can see a difference the lines have softened and skin feels really hydrated. After wasting lots of money on products over the years, what this has achieved in a very short time is amazing! Used to hate doing morning/evening routine but now I love it! Could go on about these products but I suggest you try them for yourself. Very happy customer 💕

  16. Rated 5 out of 5

    Amanda Tait

    Since starting Bk at night I can honestly say my skin has never felt better! my pores have diminished and my skin feels so hydrated and healthy. I cant imagine going back to other products now, this and Bd is all I need.. which is a big call coming from someone with a skincare addiction like mine. Once you try it and see the changes occur in your skin, you will be hooked on that glowy and plump skin feeling!

  17. Rated 5 out of 5


    Liquid gold! Everyone needs this serum in there life! My skin looked brighter overnight – I loveeee it!

  18. Rated 5 out of 5


    Having previously struggled with dryness and flaking with other actives such retinol, Bk has been a saviour. I use Bk daily around my eyes and all over my face at least once a week and my skin is always glowing the next day. A must for any skin care routine.

  19. Rated 5 out of 5


    I swear once I started using the Bk serum my skin has become so plump and my pores look like they’re disappearing. I have really enjoyed this new addition to my skincare routine. My skin has become softer/healthier and has given me a beautiful glow..Great for sensitive skin to 😊

    If your looking for a flawless, youthful appearance the Bk serum is for you!

  20. Rated 5 out of 5


    A saviour in a bottle! Earlier this winter the skin around my eyes was dry, irritated and inflamed. After just a few days of using the Bk serum I noticed an amazing improvement. 2 months on, not only is the skin around my eyes soft, hydrated and happy, my fine lines from dehydration have disappeared! I also pop this on my lips under my SPF lip balm and it keeps them hydrated and plump!

  21. Rated 5 out of 5


    WARNING! THIS IS A GAME CHANGER!!!!!!!! I’m telling you, if you don’t want to live with the same problem skin you are right now, you NEED BK! I’m a skeptic, and after using Bk on my entire face overnight, I was sold! This is by far the best product I have ever used. And it’s all I use! Night time I use Bk, day time I use Bd. I wash my face and then these are the only two products I use. My husband is low key stoked about all the extra bathroom bench space by the way. My face has a much more even skin tone all over, it is always hydrated (even now in the windy cold Winter), I rarely have a breakout anymore, it feels more plump and looks younger. The best bit is the compliments when other people notice the difference! Personally I’d like to keep it to myself and be the only one looking younger…. but this game changer is making HUGE disruptions to the beauty industry, and you were going to find out about it anyway, so I thought I’d share my opinion of this liquid gold! Do yourself a favour 😉

  22. Rated 5 out of 5


    They say “less is more” –
    and in Biologi’s case, this is outstandingly true.

    Firstly, you need to know that I am a self-confessed skincare ‘junkie’ who has been on a consistent (ever hopeful) search for that elusive ‘unicorn’ of a product:

    ie: Something that is so 100% natural (that you could eat it) – but that also actually WORKS for someone in their mid 40’s whose skin is temperamental (to say the least) and has an unruly mind of its own.

    I mean, I finally got rid of Pimples… only to discover my first Wrinkle (who then invited MORE to the party) … then BOTH usurpers decided to hang out together – and invite Pigmentation into the mix!

    Awesome (not).

    Finding products to address ALL my issues meant a LOT of (expensive) trial and error and the endless ‘layering’ of many products (PLUS precious TIME).

    Then, finally finding a results-producing routine – only to have life (and the weather) change (slightly) and woohoo all bets are off.

    Honestly – my skin is like a rebellious teenager who will ALWAYS act up when I’m going somewhere important. Sigh.

    I had resigned myself to looking ancient one day with biscuit dry skin and discolouration (cleverly concealed) to oily teenage breakout skin the next.
    double sigh.

    I was also BORED hearing about what isn’t possible in the skincare world and about preservatives and additives (etc) ALWAYS being necessary (blah blah blah – yawn)

    Well, thank goodness Ross M, didn’t take any notice of this either 😉

    Innovation in any field excites me – but in the natural skincare world …? Well, Biologi had ME at ‘stable natural vitamin C extract’ (which has always had that ‘impossible’ word attached to it)
    *(pssst… That white Ascorbic acid powder isn’t a ‘true’ and whole vitamin C – and this is proven when you realise that it can’t cure anyone of scurvy – anyway I digress… 😉

    So… ever the hopeful… It was with great interest (but no expectations) that I embarked upon my Biologi journey.

    I’ve been trialling Bk (around eyes) for about 6 weeks (along with the rest of Biologi’s Australian native skincare family). and am about to embark on the night-time routine.

    My verdict so far?

    Simple – Yep … I 100% agree with what everyone else on the reviews has already said.

    I also don’t have to worry about any synthetic anythings being absorbed into my PEA brain (ha) and causing long or short-term issues (wink).

    So there you have it – Less is more:

    LESS time, fuss, steps, confusion, allergy concerns etc
    MORE results, consistent and stable delicate eye skin balance, regenerative anti-aging powers – naturally.

    … and the BEST part of all … ?

    A natural product that really and truly works with ZERO toxins = Peace of mind.

    x x x x x (five-star kisses from me)

  23. Rated 5 out of 5


    Bk is an amazing product!
    I don’t know how I survived before I discovered this little beauty! I’ve never found a product to target my eye area which I actually received results from, from cheap to expensive, most products with the word eye on the packaging started to make me feel it was all a gimmick!
    Until I tried Bk! Confidence in a bottle, I could feel the difference it had on my skin! AND see it my friends were also commenting and saying something was different! I looked like I was glowing!

  24. Rated 5 out of 5

    Niki Wright (nz)

    I absolutely love this product. My fine lines are reducing and my skin is so hydrated and smooth. I love the fact that it is 100% organic and natural. Thanks Biologi

  25. Rated 5 out of 5

    Judi Smith

    I have generous smiles lines around my eyes from doing a lot of it. At 64 years I accepted that. Then started using Bk after a friend suggested I just “try it” and immediately the lines softened. Then spread Bk to the brow lines and they too diminished. Using Bk around the mouth now. You only need a drop as it spreads easily. A bottle lasts me 3 months. Try it too. And keep smiling.

  26. Rated 5 out of 5

    Shelley Mcilvride

    This is by far one of my favourite products. I had pigmentation under my eye that couldn’t be treated with laser and this has totally reduced the appearance of it. LOVE IT!

  27. Rated 5 out of 5

    Sarah Sorbello

    To finally find an eye serum that is giving me the results of crows feet lines fading is a Godsend , this serum keeps my face still looking fresh

  28. Rated 5 out of 5


    Bk the little pocket rock that has not only dealt a heavy blow to the wrinkles around my eyes but those around my mouth, and what blows me away most is how Bk deals with sun damage! Kissing it goodbye!

  29. Rated 5 out of 5

    Olivia Griffiths

    Bk makes me wake up feeling like I don’t need to put on make-up, it has hydrated my eye area and stopped me getting milia, those hard white dots, around my eyes. I use this on my face at night too which makes me super hydrated and I no longer need to use any form of moisturiser. I also always put a dab across a neck scar from a recent surgery – it’s softening the scar tissue for that too!

  30. Rated 5 out of 5


    Absolutely in love with this product! I have never really found a skincare product/regime that has worked for me enough to use long term. I have always used different products and brands and never really stuck with anything in the contstant search for results. This serum is so incredibly hydrating! I have not needed to moisturise (something I usually need to do religiously!) and it has greatly improved the texture and luminosity of my skin after just a few weeks. Cannot wait to try the entire range!

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