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Today is a review of the 5% Niacinamide Complex Repair Solution from 28 Day Skin. I’ve probably only got a handful of uses left so I thought now would be a good time to review it!

First off let me introduce you to the brand… 28 Day Skin is a skintech + skincare business who believes that happy skin results from a happy synergy of brain-gut-skin and their products are geared towards providing that synergy. They believe good skincare should come from evidence led science, not trends and they choose their ingredients based on effectiveness, not whether they are natural, green or allegedly clean. 

Now that’s done, let me just say that I LOVE niacinamide as an ingredient, it’s potentially one of my favourites and I always ensure it’s in my AM and PM routine! Niacinamide can help to:

  • fade discoloration 
  • reduce the appearance of wrinkles
  • make the skin plumper and improve skin’s elasticity
  • reduce redness (thanks to its anti-inflammatory properties)
  • diminish enlarged pores
  • regulate oil and bacteria production to help combat breakouts

To read more about niacinamide you can check out my blog post ‘EVERYTHING YOU NEED TO KNOW ABOUT NIACINAMIDE’, HERE.


BRAND: 28 Day Skin

PRODUCT: 5% Niacinamide Complex Repair Solution

INGREDIENTS: See bottom of page.


  • 5% Niacinamide (Vitamin B3) combination serum fades discoloration, reduces the appearance of wrinkles, makes the skin plumper, and improves your skin’s elasticity.
  • Anti-inflammatory action reduces redness, diminishes enlarged pores and regulates oil and bacteria production to combat breakouts.
  • N-Acetyl Glucosamine reduces dark spots, scars and signs of ageing.
  • Contains amino acids (the body’s natural building blocks) which hydrate and restore the skin’s barrier function for a fuller, even-toned and more youthful complexion.
  • Also contains sodium hyaluronate, zinc, green tea extract, sulfur and aloe extract.
  • Fragrance and colourant-free
  • Vegan and not tested on animals

I’ve Got *Insert Skin Type Here* Skin, Can I use It?

This serum is suitable for all skin types but 28 Day Skin does suggest that those with sensitivities to aloe introduce the serum to their skin slowly. 

28 day skin

My Experience With This Serum?

Patch Test Kit

When I first received this serum from 28 Day Skin, the first thing that impressed me was the fact that it came with a Patch Test Kit. So this is a small amount of the product that you have purchased in a small tube, with a swab, ready for you to apply a test patch behind your ear/on the inside of your elbow to check for any adverse reactions over a 24 hour period. If you have an adverse reaction you can then send the unopened full size serum back to the brand, free of charge, for a full refund. The Patch Test Kit comes with every product of theirs.

I really liked this because how many times have you bought a product and your skin has reacted to it?! It’s not only annoying and disappointing, it’s also costly as you’re left with a product that you can no longer use!

The First Use

Once I had completed the patch test with no concerns, I hastily opened the full sized product to use in my evening routine. My skin at the time was purging and irritated from my very new use of tretinoin (a strong form of vitamin A known as ‘retinoic acid’). 

I noticed that as I applied the serum that I had no stinging or irritation (5% niacinamide is the percentage proven to visibly make a difference without causing any irritation), which I expected because my skin was sensitised from the tretinoin. But nope, it applied like a dream, no pilling, no foam, just sank in quickly and seamlessly into my skin!

The next morning I woke up to find that the redness from my spots was very minimal and my skin, overall, looked hydrated, dewy and calm – the dream!

With Continued Use

These results continued as the weeks went by. However, with me being the scientist that I think I am, I wanted to conduct a little test and so I stopped using the serum for a week. Let me tell you… my skin was not happy with me! The sensitivity from my tretinoin came back and just generally, my skin didn’t look as dewy or settled as it had done previously! This pretty much showed me how much my skin loved this serum.

I’m now nearly at the end of the 30ml bottle after using it twice a day since January so that’s testimony to how much I enjoyed this product.


The serum is scent free and sinks into the skin quickly but it does leave a tacky finish on me. However, you always follow your serums with a moisturiser and so the tackiness doesn’t last past your application of moisturiser. Instead you’re just left with a gorgeous natural glow.

28 day skin

How Do I Use This Serum?

28 Day Skin says to ‘Apply a small amount to the skin and allow it to completely absorb before following with moisturiser.’.

To build on that, I would say that this is a water based serum and so you want it to come before any oil-based serums and creams. It’s also perfectly fine to use twice a day if desired.

I personally use this serum in my AM routine, after my vitamin C serum and before my hydration serum (if required as this serum is actually hydrating enough to act as a hydration serum too!). In my PM routine, I use it after toner and before my tretinoin cream. I always apply my niacinamide serum on damp skin (mist with a facial mist or water to dampen your skin), because this increases the absorption of your serums.

And yes, niacinamide can be used alongside your vitamin C serum without any concerns (vitamin C and niacinamide do not cancel each other out, despite the rumours!) and alongside your acids. HOWEVER, with acids some people, not everyone, can experience what is known as a ‘niacin flush’. So basically your skin can flush red for a short period of time after using acids and niacinamide together. If this happens to you, don’t use acids and niacinamide at the same time… obviously!

Gimme The Deets…


30ml: £18.99
10ml: £13.99

You can purchase this serum and other products from 28 Day Skin directly from their website HERE or from Amazon, HERE.


POA =  12 months

No special storage required.

Stick Or Spin Again?

As I’ve said, I have very nearly finished this serum and I would 100% repurchase in the future! I’m not repurchasing it straight away because I have other niacinamide serums in the line-up to test but I know I will be back to this one in the future.

Have you tried anything from this brand? Let me know your thoughts in the comments section below.

Love & Knowledge,

S A M A N T H A 


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INGREDIENTS: Aqua, Aloe Barbadensis Juice Extract (skin-soothing – good), Niacinamide (skin-soothing/restoring, antioxidants, vitamin B3 – best), Panthenol (humectant, pro-vitamin B5 – best), N-Acetyl Glucosamine (skin-replenishing/soothing, hydration, antioxidant – best), Camellia Sinensis (Green Tea) Leaf Extract (skin-soothing/antioxidant – best), Dimethyl Sulfone (antioxidant – good), Zinc PCA (skin-conditioning – best), Sodium Hyaluronate (skin-replenishing/restoring – best), Arginine (antioxidant – good), Carnitine (antioxidant – best), Carnosine (antioxidant – best), Glycine (skin-replenishing – good), Histidine (antioxidant – good), Lysine (antioxidant/skin-replenishing – good), Proline (antioxidant/skin-replenishing – good), Lecithin (emollient/skin-replenishing – best), Sclerotium Gum (thickener/emulsifier – good), Xanthan Gum (thickener/emulsifier/texture enhancer – good), Sodium Citrate (antioxidant/preservative – good), Pullulan (antioxidant/texture enhancer – good), Phenoxyethanol (preservative – good).

*ratings allocated according to Paula’s Choice Ingredient Dictionary and Incidecoder.

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