✶

NIOD Copper Amino Is… vs Paula's Choice Clini… — Which Is Better? | Gracie

Products
Ingredients
Brands
K-Beauty
Blog
How We Score

Gracie
/Compare
/NIOD Copper Amino Isolate Serum 3 1:1 (CAIS3)
/vs
/Paula's Choice Clinical 1% Retinol Treatment

NIOD Copper Amino Isolate Serum 3 1:1 (CAIS3) vs Paula's Choice Clinical 1% Retinol Treatment

Paula's Choice Clinical 1% Retinol Treatment scores 8.9/9.8 vs NIOD Copper Amino Isolate Serum 3 1:1 (CAIS3) at 7.7/9.8. Paula's Choice Clinical 1% Retinol Treatment wins for hydration.

Head to head

NIOD

Copper Amino Isolate Serum 3 1:1 (CAIS3)

serum

7.7

Buy at Amazon

Compare

Best Moisturisers
Best Serums
Best Cleansers
Best SPF

Ingredients

Niacinamide
Retinol
Hyaluronic Acid
Salicylic Acid

K-Beauty

K-Beauty Hub
K-Beauty Moisturisers
K-Beauty Serums
K-Beauty Sunscreens

About

Methodology
About Us
All Brands
All Products

Gracie

Honest skincare intel. No jargon, no gatekeeping — just the ingredients decoded.

Paula's Choice

Clinical 1% Retinol Treatment

serummid-range

8.9

Score comparison

Paula's Choice Clinical 1% Retinol Treatment takes this one, winning 2 of 5 attributes.

NIOD wins 1

Tied 2

Paula's Choice wins 2

9.0

NIOD

Paula's Choice

Ingredient face-off

11% overlap

21NIOD

5Shared

47Paula's Choice

Only in NIOD Copper Amino Isolate Serum 3 1:1 (CAIS3)

16 unique

Aqua (Water)Tripeptide-29 Tripeptide-1 Copper Acetate Tripeptide-1 Acetate Myristoyl Nonapeptide-3 Trifluoroacetyl Tripeptide-2 Acetyl Tetrapeptide-2 Sodium Hyaluronate Crosspolymer Glycogen Propanediol+6 more

Shared ingredients

5 in common

Glycerin Pentylene Glycol Caprylyl Glycol Ethylhexylglycerin Phenoxyethanol

Only in Paula's Choice Clinical 1% Retinol Treatment

42 unique

Aqua Dimethicone Butylene Glycol Isononyl Isononanoate Castor Isostearate Succinate Glyceryl Stearate C12-15 Alkyl Benzoate Dimethicone Crosspolymer Polysorbate 20 Behenyl Alcohol+32 more

Why Paula's Choice Clinical 1% Retinol Treatment comes out ahead

Where Paula's Choice Clinical 1% Retinol Treatment really shines is hydration efficacy, scoring 9.8 compared to NIOD Copper Amino Isolate Serum 3 1:1 (CAIS3)'s 4.8. With Glycerin, Butylene Glycol, and Sodium Hyaluronate in its top ingredients, Paula's Choice Clinical 1% Retinol Treatment delivers stronger moisture-binding capability.

Active Ingredient Strength is another area of separation. NIOD Copper Amino Isolate Serum 3 1:1 (CAIS3) scores 7.7 here versus 7.1 for Paula's Choice Clinical 1% Retinol Treatment. That difference comes down to how each formula is built — the ingredient list tells the story.

Paula's Choice Clinical 1% Retinol Treatment brings Retinol, Palmitoyl Tetrapeptide-7, and Dipotassium Glycyrrhizate as actives, while nIOD Copper Amino Isolate Serum 3 1:1 (CAIS3) relies on Acetyl Tetrapeptide-2. Both approaches have merit, but the positioning and supporting ingredients make the difference.

Best for your skin type

NIOD Copper Amino Isolate Serum 3 1:1 (CAIS3) is better if you have

Sensitive skin — the low-irritation formula keeps things gentle
Targeting specific concerns like aging or uneven tone — Acetyl Tetrapeptide-2 does the heavy lifting
Anyone who prefers clean, well-vetted formulations

Paula's Choice Clinical 1% Retinol Treatment is better if you have

Sensitive skin — the low-irritation formula keeps things gentle
Dry or dehydrated skin that craves moisture, thanks to Glycerin
Targeting specific concerns like aging or uneven tone — Retinol does the heavy lifting

Value comparison

Paula's Choice Clinical 1% Retinol Treatment comes in at mid-range pricing with a 8.9 score, which is solid value at that tier.

Our verdict

✶ Our verdict

+1.2 lead

Paula's Choice Clinical 1% Retinol Treatment wins this comparison with a meaningfully stronger ingredient profile and overall score.

7.7NIOD

8.9Paula's Choice

Frequently asked questions

Which is better: NIOD Copper Amino Isolate Serum 3 1:1 (CAIS3) or Paula's Choice Clinical 1% Retinol Treatment?

Based on ingredient analysis, Paula's Choice Clinical 1% Retinol Treatment scores higher overall. See the full score breakdown above for details on each attribute.

Do NIOD Copper Amino Isolate Serum 3 1:1 (CAIS3) and Paula's Choice Clinical 1% Retinol Treatment share ingredients?

Yes, they share common ingredients. Check the ingredient face-off section above for a detailed comparison.

What's the main difference between NIOD Copper Amino Isolate Serum 3 1:1 (CAIS3) and Paula's Choice Clinical 1% Retinol Treatment?

The key differences are in their active ingredients and formulation approach. Check the attribute battle above for a detailed breakdown.

Full analysis: NIOD Copper Amino Isolate Serum 3 1:1 (CAIS3)→Full analysis: Paula's Choice Clinical 1% Retinol Treatment→

We may earn a commission from purchases made through our links, at no extra cost to you. This helps us keep Gracie free and independent.

Some links on this site are affiliate links. We may earn a commission from purchases made through our links, at no extra cost to you. This helps us keep Gracie free and independent.