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Last Updated on September 7, 2026 by Giorgia Guazzarotti

niod copper amino isolate serum 3

You don’t know what you’ve got till it’s gone. That’s how I felt about NIOD Copper Amino Isolate Serum 3 1:1. The first time I tried it, it wasn’t love at first sight. It just didn’t seem to do anything! But when I ran out, oh my, did I see a difference! I couldn’t put my finger on it but somehow, my skin just didn’t look as good anymore. It took longer to heal. It was just behaving differently (and not in a good way!).

And that pretty much sums up my experience with NIOD CAIS3: it works, but the results are subtle. This isn’t a serum that dramatically changes your skin overnight. It definitely doesn’t work after a single use. It’s more of a long-term maintenance product that helps keep skin looking and behaving its best. Let’s get into the full review now.

The Verdict

My rating: 4/5.

Best for: Anyone who already has the basics of a good anti-aging routine in place and wants to add copper peptides for extra skin-repair and anti-aging support.

Skip it if: You want dramatic results, you’re on a tight budget, or you haven’t nailed the basics like sunscreen and retinoids yet.

What I like: The super-lightweight texture, how quickly it sinks in, and the subtle improvement I notice in how smooth and healthy my skin looks and behaves.

What I don’t: The results are subtle, it takes time to see a difference, and it’s expensive for something that isn’t an essential part of an anti-aging routine.

Bottom line: NIOD Copper Amino Isolate Serum 3 1:1 is a good copper peptide serum for keeping skin in top shape, but don’t expect dramatic before-and-after results. I notice its benefits more when I stop using it than while I’m using it, and for me, it’s a nice extra rather than a must-have.

NIOD Copper Amino Isolate Serum 3 1:1 Ingredients: What Does The Science Say?

What’s In NIOD Copper Amino Isolate Serum 3 1:1?

GHK-Cu + GHK: The Stars Of The Formula

The main reason to buy this serum is GHK-Cu, also known as Copper Tripeptide-1. GHK-Cu is a copper peptide naturally found in the body. Research suggests it plays a role in skin repair, collagen production and inflammation. Other research has linked it to wound healing, antioxidant activity and tissue repair. Sounds amazing, right?

Not so fast. Most of the research on copper peptides has been done in labs rather than on people using copper peptide serums on their faces. A recent review of the evidence found that there’s still surprisingly little good clinical research showing how well GHK-Cu penetrates skin and reduces wrinkles when you apply it topically.

NIOD also contains 1% GHK, basically the same peptide without the copper attached. Lab research suggests GHK may also support healthy skin cells and skin repair, but again, we don’t have lots of good human studies showing what it can do for wrinkles.

So, copper peptides are promising, but they’re nowhere near as proven as retinoids for anti-aging. Hence why I recommend them only when you have all the tried and tested anti-aging actives, like retinol and sunscreen, in your skincare routine.

If you’re wondering whether you should spend your money on copper peptides or stick with retinol, I’ve compared copper peptides vs retinoids for anti-ageing here.

What About All The Other Peptides?

NIOD also includes several other anti-aging peptides. The problem? The evidence behind them is much weaker than the evidence for GHK-Cu.

  • Tripeptide-29: Made from amino acids found in collagen. A 2026 study found improvements in wrinkles, firmness and texture after four weeks, but it was tested as part of a full moisturiser, so we don’t know how much Tripeptide-29 contributed.
  • Myristoyl Nonapeptide-3: Designed to mimic some of retinoic acid’s effects. Manufacturer testing suggests it may stimulate collagen, but good independent human studies are still lacking.
  • Tripeptide-2: Often claimed to help protect collagen and elastin, but I couldn’t find convincing published human research on topical Tripeptide-2 itself.
  • Acetyl Tetrapeptide-2: A lab study found effects on human skin cells, like improvements in fine lines and texture. But again, it wasn’t tested alone.

Glycerin + Hyaluronic Acid

CAIS3 also contains glycerin and Sodium Hyaluronate Crosspolymer, a form of hyaluronic acid. Glycerin attracts water into the skin and helps keep the skin barrier hydrated. Sodium Hyaluronate Crosspolymer also holds onto water, helping skin feel softer and look temporarily smoother and plumper. If your skin looks smoother after using NIOD CAIS3, don’t automatically assume the copper peptides rebuilt all your collagen. Some of that improvement may simply come from better hydration.

My Experience With NIOD Copper Amino Isolate Serum 3 1:1

  • Skin condition: Generally in good condition, with a few fine lines but no deep wrinkles or major skin concerns.
  • Copper peptide experience: I’ve used previous versions of NIOD CAIS before, so I already knew what to expect from copper peptides.
  • How long I used it: 3 months.
  • How often: Every other night, right after cleansing.
  • What I noticed: A small improvement in skin texture. The results were subtle, but my skin seemed to look and behave better with consistent use.
  • Verdict: A great maintenance serum, but not a must-have.

Texture

If you’re worried that a higher concentration of copper peptides translates into a thicker, sticky texture, don’t. Its consistency is every bit as watery and lightweight as its predecessor. It absorbs just as fast. Phew!!

Fragrance

The serum itself is fragrance-free. But the ingredients don’t smell the best. Still, it fades away fast, so it doesn’t really bother me.

How To Use It

Unlike the old CAIS 2, NIOD CAIS3 comes pre-mixed, so there’s no activator to pour in or bottles to shake together. Apply a few drops morning and night right after cleansing, before thicker serums, moisturisers and oils. Gently massage it in and give it a few seconds to absorb before moving on with the rest of your routine. And yes, it’s still that gorgeous bright blue colour.

Packaging

NIOD CAIS3 comes in a dark glass bottle with a dropper applicator. It looks sleek, feels suitably premium for the price, and the dark bottle helps protect the formula from light. The dropper also makes it easy to control how much product you use, although the serum is so watery that you need to be a little careful not to drip it everywhere. Overall, the packaging is practical, simple and works well for the formula.

niod copper amino isolate serum 3

Performance & Personal Opinion

Copper peptides aren’t the kind of ingredient that gives me an instant wow effect, and NIOD CAIS3 was no exception.

During the first few weeks: Honestly, I didn’t notice much. My skin already looked pretty good, so there wasn’t an obvious change in fine lines, skin texture or anything else I could point to.

After about a month: I started to notice a small improvement in my skin’s texture. It looked smoother and just generally healthier, but the difference was subtle.

What surprised me most: I actually noticed the difference more AFTER I stopped using it. My skin didn’t look quite as good and seemed to take longer to recover when something irritated it. That’s why I think of copper peptides as more of a maintenance ingredient than something that dramatically transforms your skin.

Who Should Buy NIOD CAIS3?

Try it if:

  • You already have sunscreen, retinoids etc. covered and want to take your anti-ageing routine further.
  • You specifically want a high-concentration copper peptide serum.
  • You prefer very lightweight serums.
  • You’re patient enough to wait for subtle results.

Who Should Skip It?

  • You’re looking for dramatic wrinkle reduction.
  • You’re on a tight skincare budget.
  • You haven’t yet invested in proven basics like sunscreen.
  • You just want to experiment with copper peptides (a cheaper serum makes more sense first).

Does Niod Copper Amino Isolate Serum 2:1 Live Up To Its Claims?

CLAIM TRUE?
A foundational copper peptide (1% GHK-Cu) serum to help restore the look of healthy skin. True. Keep in mind, it promises it will make your skin LOOK better, not function better or repair anything.
Improves the look of skin aging, minimizing the appearance of fine lines and wrinkles. True. Again, it only promises to improve the look of wrinkles, not affect their size.
Promotes natural collagen, helping skin feel firmer over time. It can help, but other ingredients (like retinoids) have more evidence supporting this.

Price & Availability

$93.00 at Cult Beauty, Niod, Sephora, and SpaceNK

What Age Should You Start Using Copper Peptides?

There’s no magic age when you suddenly need copper peptides. Your natural levels of GHK do go down as you get older. One review found they’re much higher in your 20s than they are later in life. But that doesn’t mean everyone needs to start using copper peptides the second they turn 30. If you’re starting to notice signs of ageing and already have the basics covered, copper peptides can be a nice extra.

NIOD CAIS3 vs The Ordinary Multi-Peptide + Copper Peptides 1%: Which Is Better?

Both contain 1% copper peptides, so on paper, The Ordinary looks like the better deal. But that wasn’t my experience.

  • NIOD CAIS3: Contains 1% GHK-Cu + 1% free GHK, plus several other peptides. It’s much more focused on copper peptides.
  • The Ordinary Multi-Peptide + Copper Peptides 1%: Contains 1% copper peptides plus several other peptides, amino acids and hyaluronic acid.
  • My experience: The Ordinary did absolutely nothing for my skin. With NIOD, the results are subtle, but I do notice my skin looks and behaves better when I use it consistently.

What Can You Use With NIOD CAIS3?

There’s a LOT of conflicting advice online about what you can and can’t mix with copper peptides. Most of it is repeated from brand instructions rather than actual research. Here’s what the science says:

  • Hyaluronic acid: YES. A 2023 study found that GHK-Cu and hyaluronic acid worked well together and increased collagen IV in skin cells and ex-vivo human skin.
  • Glycerin, ceramides, niacinamide and moisturiser: YES. There’s no evidence that any of these ingredients deactivate GHK-Cu or stop it from working.
  • Sunscreen: YES. There’s no known problem with using copper peptides underneath sunscreen. In fact, if you’re using CAIS3 for anti-aging, sunscreen is far more important than copper peptides in the first place.
  • Retinoids: Probably yes. I couldn’t find a study showing that retinol, retinal or tretinoin destroys GHK-Cu or vice versa. There also aren’t good clinical trials testing the two together. So the common claim that you can’t combine copper peptides and retinoids isn’t backed by good evidence. If your skin tolerates both, you can use them in the same overall routine. Personally, I’d make life easier and use CAIS3 in the morning and my retinoid at night.
  • Exfoliating acids: There’s no proof you must avoid them. One study testing GHK-Cu stability found it remained stable between pH 4.5 and 7.4, so the idea that anything acidic automatically destroys copper peptides is too simplistic. Strong glycolic, lactic and salicylic acid products can have a lower pH than that, though, and we don’t have good studies testing them directly with GHK-Cu. I’d separate them to be on the safe side, especially if your skin gets irritated easily.
  • Pure vitamin C (L-ascorbic acid): This is the one I’d separate. The chemistry gives us an actual reason to be cautious here. Copper can speed up the oxidation of ascorbic acid. But there’s an important catch: those studies involve copper ions, not a finished GHK-Cu serum layered with vitamin C on human skin. GHK holds onto copper, so we can’t automatically assume the same thing happens with CAIS3. Still, this combination has enough chemistry behind the concern that I’d use vitamin C and CAIS3 at different times of day.
  • “Strong antioxidants:” I’d ignore that as a blanket rule. Antioxidant covers a huge range of completely different ingredients, and there’s no scientific reason to assume they all clash with copper peptides. GHK-Cu itself has even shown antioxidant effects in lab research.

Can Copper Peptides Replace Retinol?

No. I wouldn’t swap my retinoid for copper peptides. Copper peptides are promising, but the evidence is still limited. Retinoids have decades of research showing they can improve wrinkles, pigmentation and other signs of sun damage. If I had to choose between spending my money on a good retinoid or NIOD CAIS3 for anti-aging, I’d pick the retinoid first.

The Verdict: Should You Buy It?

It’s not an absolute must-have. But, if you’re past 30 and have some extra money to burn, this can help your skin stay in top shape.

Ingredients

Aqua/Water/Eau, Glycerin, Tripeptide-29, Tripeptide-1 Copper Acetate, Tripeptide-1 Acetate, Myristoyl Nonapeptide-3, Tripeptide-2, Acetyl Tetrapeptide-2, Sodium Hyaluronate Crosspolymer, Glycogen, Propanediol, Pentylene Glycol, Dimethyl Isosorbide, Ethoxydiglycol, Isoceteth-20, Leuconostoc/Radish Root Ferment Filtrate, Caprylyl Glycol, Ethylhexylglycerin, Phenoxyethanol, Chlorphenesin.

Niod Copper Amino Isolate Serum 3 Review: Is It Worth It?

Can Niod Copper Amino Isolate Serum 3 really optimise your skin, promote collagen, and reduce the look of fine line and wrinkles?

Product Brand: Niod

Product Currency: USD

Product Price: 93

Product In-Stock: InStock

Editor's Rating:
4