Is The Ordinary's 23% Vitamin C Suspension stronger than Paula's Choice C15?

The disclosed number is higher, but The Ordinary's version is a water-free suspension, not a solution — the acid sits partly undissolved as a fine powder, which is why grit and stinging are the most common complaints. Classic percutaneous-absorption research also found skin tissue levels of L-ascorbic acid saturate around 20%, so the extra percentage over Paula's Choice's 15% may not translate into meaningfully more delivered vitamin C.

Dupe report Nº 038 / L-ascorbic acid (vitamin C) serums

Paula's Choice C15 Super Booster dupes, ranked by formula match

The Ordinary discloses a HIGHER 23% of the identical vitamin C form for about a fifth of the price.

The verdict / read the actives, not the marketing

There is no exact Paula's Choice C15 Super Booster dupe. Paula's Choice C15 Super Booster states '15% vitamin C' and confirms Ascorbic Acid (L-ascorbic acid) as the 2nd ingredient, immediately after water — a real, single-form, high-concentration vitamin C serum with ferulic acid and two peptides (Tridecapeptide-1, Palmitoyl Tripeptide-5) built in. The Ordinary's Vitamin C Suspension 23% + HA Spheres 2% discloses a HIGHER concentration of the identical form — pure L-ascorbic acid, confirmed as its own 1st ingredient — for about a fifth of the price. This is not a diluted copy; the disclosed number and the delivered acid form both favor the cheaper product. What does not carry over: the vehicle and the supporting cast. Paula's Choice is a water-based solution with ferulic acid and peptides; The Ordinary is a water-free silicone suspension with no ferulic acid and no peptides, and its acid sits undissolved as a fine powder rather than in solution — a real texture trade-off (frequent stinging and grit are the top reported complaints) that the higher percentage doesn't offset for everyone.

15 % ✓ original L-ascorbic acid

$8.10 vs $41.25 original The Ordinary

Best available match: 74% base-formula score — the highest we measured across the candidates. Scores reflect formula proximity — read the actives column for the clinical story. How we score ↓

The winner

The Ordinary Vitamin C Suspension 23% + HA Spheres 2%

Discloses a HIGHER 23% pure L-ascorbic acid — the identical form as the original's disclosed 15%, confirmed as this product's own 1st ingredient. At $8.10 versus $41.25, about a fifth of the price. Honest caveat: a water-free silicone suspension with no ferulic acid or peptides, versus the original's water-based, ferulic-acid-and-peptide formula — the acid sits partly undissolved, and grit/stinging are the most common complaints.

Buy on Amazon $8.10 Breakdown ↓

The stronger pick — experienced users

The Ordinary Vitamin C Suspension 23% + HA Spheres 2%

23% L-ascorbic acid vs the original's 15% — more potent, can be more irritating. Know your skin first.

Buy on Amazon $8.10 Breakdown ↓

Some links earn us a commission. It never changes the verdict — the methodology is public.

02 / The scoreboard

2 formulas, one number that matter

Read the actives column first — it is the apples-to-apples comparison. $ per gram of active is what the working ingredients cost you; the base-formula score is supporting evidence, not the verdict.

Product	Actives vs original	$ / g of active	Price	Base formula	Verdict
Paula's Choice C15 Super Booster	Concentration disclosed in product name	$13.75	$41.25 20 mL · Amazon	100% the reference	The original
Partial overlap missing actives — different formula wearing the keywords
The Ordinary Vitamin C Suspension 23% + HA Spheres 2%	Concentration disclosed in product name	$1.17	$8.10 30 mL · Amazon	74% highest measured	The winner Amazon →

✓ same % as original ≠ different % ? in formula, % undisclosed — not in formula

03 / The original

Why the original is the original

C15 Super Booster states "15% vitamin C" and confirms it: Ascorbic Acid (L-ascorbic acid) sits 2nd on the INCI, immediately after water — a real, high-concentration, single-form vitamin C serum, built out with ferulic acid and two peptides (Tridecapeptide-1, Palmitoyl Tripeptide-5) in a water-based, CE-Ferulic-style formula.

The Ordinary's Vitamin C Suspension 23% + HA Spheres 2% discloses a HIGHER concentration of the exact same form — pure L-ascorbic acid, confirmed as its own 1st ingredient — for around a fifth of Paula's Choice's price. This is not a diluted copy: the disclosed number and the acid form both favor the cheaper product.

What doesn't carry over is the vehicle and the supporting cast. Paula's Choice is a water-based solution with ferulic acid and peptides baked in; The Ordinary is a water-free silicone suspension with neither — its acid sits undissolved as a fine powder rather than in solution, which is exactly why grit and stinging are the most common complaints about it. Classic percutaneous-absorption research on L-ascorbic acid also found skin tissue levels saturate around 20%, so the extra few points over Paula's Choice's 15% likely buy less delivered vitamin C than the sticker suggests, not more.

04 / The candidates

Every candidate, examined

01 / The Ordinary

The winner

The Ordinary Vitamin C Suspension 23% + HA Spheres 2% bottle

$1.17 per g of active

$8.10 retail · 30 mL

74% base formula · highest of 6

The Ordinary Vitamin C Suspension 23% + HA Spheres 2%

Shared formula DNA 2 of 26 original ingredients present

Water Ascorbic Acid Glycerin Ethoxydiglycol PPG-26-Buteth-26 Mannitol Tridecapeptide-1 Palmitoyl Tripeptide-5 Sodium Hyaluronate Pentylene Glycol PEG-40 Hydrogenated Castor Oil Bisabolol Sodium Gluconate Decylene Glycol Ferulic Acid Oryza Sativa (Rice) Bran Extract Tocopherol Polyacrylate Crosspolymer-6 1 2-Hexanediol Panthenol Sodium Phytate Sodium Hydroxide Citric Acid Ergothioneine Phenoxyethanol

shared with original not shared rare marker — weighs more in the score

What matches: Discloses a HIGHER 23% pure L-ascorbic acid — the identical form and CAS as Paula's Choice's own 2nd-ingredient vitamin C, confirmed as The Ordinary's own 1st ingredient. Not a diluted copy: the number and the form both favor this side.
What differs: A water-free silicone suspension with no ferulic acid and no peptides, versus Paula's Choice's water-based, ferulic-acid-and-peptide formula. The acid sits undissolved as a fine powder rather than in solution — grit and stinging are the most common complaints, a real texture trade-off the higher percentage doesn't erase.
Who it's for: The winner if the raw disclosed concentration and price matter most to you — $8.10 versus $41.25, about a fifth of the price — but patch-test first if you're texture-sensitive.

Ships in: Packaging not verified No brand or retailer statement on the bottle — we won’t guess.
pH: pH not published L-ascorbic acid needs pH below 3.5 to absorb
Data source: Concentration disclosed in product name The Ordinary discloses 23% L-ascorbic acid in the product name and its own product page; Ascorbic Acid confirmed as the 1st (lead) INCI ingredient via INCIDecoder and Ulta. Amazon price $8.10 PA-API-verified 2026-07-30 (ASIN B07Y556CPP). Per verifiedbeautydata's own products.json record, ratings (3.4 stars / 1,265 reviews, Ulta) reflect a formula whose concentration exceeds the ~20% saturation point found in classic percutaneous-absorption research on L-ascorbic acid — the extra percentage over Paula's Choice's 15% is unlikely to translate into meaningfully more delivered vitamin C, and the water-free suspension format is a real texture trade-off some users don't tolerate.

$8.10 for 30 mL → $1.17 per gram of active — 11.7× cheaper per active gram than the original's $13.75.

Buy on Amazon $8.10

05 / Methodology

How we verified this

Verified 2026-07-30

Every formula on this page was tokenized — split into its individual INCI ingredients — and matched against the EU CosIng ingredient database, so "Aqua," "Water," and "Eau" all resolve to the same ingredient.

The base-formula match score works like this: sharing a rare ingredient counts far more than sharing a common one. Almost every serum contains water and glycerin — that proves nothing. Almost nothing contains Ethoxydiglycol or Laureth-23, so when a candidate shares those with the original, it says something real about how the formula was built. (For the statisticians: it is an IDF-weighted Jaccard similarity over the normalized ingredient lists.)

Scores are computed, not opinions. The verdict tags are our editorial read of the actives, the scores, and the prices — and the methodology stays public so you can disagree with us precisely.

Where the ingredient lists come from

Concentration disclosed in product name

Sources for this report

INCIDecoder product pages (fetched 2026-07-30) — Paula's Choice C15 Super Booster 'updated formula' listing and The Ordinary Vitamin C Suspension 23% + HA Spheres 2%
Amazon Creators API (PA-API) — live price verification 2026-07-30 (PC C15, ASIN B00EYVSOKY, $41.25; The Ordinary, ASIN B07Y556CPP, $8.10)
Target and eBay listings confirming Paula's Choice C15 Super Booster size (20 mL / 0.67 fl oz)
verifiedbeautydata products.json verified records

06 / Questions

Frequently asked

What is the best Paula's Choice C15 Super Booster dupe?: The Ordinary Vitamin C Suspension 23% + HA Spheres 2% ($8.10) discloses a HIGHER 23% pure L-ascorbic acid — the identical form as Paula's Choice's own 15% — for about a fifth of the price.
Is The Ordinary's 23% Vitamin C Suspension stronger than Paula's Choice C15?: The disclosed number is higher, but The Ordinary's version is a water-free suspension, not a solution — the acid sits partly undissolved as a fine powder, which is why grit and stinging are the most common complaints. Classic percutaneous-absorption research also found skin tissue levels of L-ascorbic acid saturate around 20%, so the extra percentage over Paula's Choice's 15% may not translate into meaningfully more delivered vitamin C.
What does Paula's Choice C15 Super Booster have that The Ordinary doesn't?: Ferulic acid and two peptides (Tridecapeptide-1, Palmitoyl Tripeptide-5) in a water-based, CE-Ferulic-style formula. The Ordinary's suspension has neither.