L-ascorbic acid 15 %, 30 ml airless pump with folding carton, Formula 1.0, lot 26-0918-C.

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by the paper

L-ascorbic acid 15 %

Formula 1.0Lot 26-0918-CUse within 90 d

Packed 2026-09-18 · Printed at fill

15 % L-ascorbic acid at pH 3.2

30 ml · 1.0 fl oz · opaque airless pump

Actives

L-ascorbic acid 15 %

α-tocopherol 1 %

Ferulic acid 0.5 %

pH at fill 3.2

Ingredients L-ascorbic acid, α-tocopherol, ferulic acid. Carrier: water, propanediol, ethoxydiglycol, listed and justified in the dossier: the actives need a solvent. Nothing else.
Not in here Fragrance, Color, Botanical extracts, “Preservative-free” claims. Reasons in the dossier.

Use 4 drops, mornings, under sunscreen. It stings at this pH. It turns orange when it is done.

Dossier bythepaper.com/products/l-ascorbic-acid-15
This lot's tests bythepaper.com/pages/lot/26-0918-c
Dispute this formula bythepaper.com/pages/dispute

Cosmetic · Formula 1.0

L-ascorbic acid 15 %

15 % L-ascorbic acid at pH 3.2

Evidence grade: B grade scale
Latest lot: 26-0918-C, packed 2026-09-18
Pack: 30 ml · 1.0 fl oz · opaque airless pump
Shelf: Use within 90 d

$38.00 USD

Use

4 drops, mornings, under sunscreen. It stings at this pH. It turns orange when it is done.

Not in here

Fragrance, Color, Botanical extracts, “Preservative-free” claims. Reasons below.

Illustrative formula. Nothing ships before testing.

Dossier

L-ascorbic acid 15 % Formula 1.0

§ 1

Formula

Ingredient	Amount per serving	Note
L-ascorbic acid	15 %	Active
α-tocopherol	1 %	Active, stabiliser
Ferulic acid	0.5 %	Active, stabiliser
Water, propanediol, ethoxydiglycol	to 100 %	Carrier. The actives need a solvent; justified in the dossier.

Actives

L-ascorbic acid 15 %

α-tocopherol 1 %

Ferulic acid 0.5 %

pH at fill 3.2

Changelog

Version	Date	Change	Reason and evidence
1.0	2026-09-04	Initial formula.	15 % at pH ≤ 3.5 is where uptake was shown; C + E + ferulic is the stabilised combination in the literature. Dossier pending.

§ 2

Evidence

L-ascorbic acid Evidence grade B

Outcome: Photoprotection adjunct and reduction of hyperpigmentation with topical use at low pH.
Dose in the literature: 10 to 20 % L-ascorbic acid at pH below 3.5 is where skin uptake was shown; above 20 % adds nothing measurable.
Our dose: 15 % at pH 3.2.
Trials: Trial list pending. Each entry will carry PMID, n, duration, dose and effect size. Trials at lower doses listed with what they found. Negative trials listed.
Form: L-ascorbic acid, not a derivative. Derivatives (MAP, SAP, ascorbyl glucoside) have weaker conversion evidence; the review will be linked.
Supplier: Published with the first lot.
Spec: Assay ≥ 99 % · pH at fill 3.2 ± 0.1
Lot tests: Assay by HPLC at fill and at 90 days · pH · colour (oxidation) · microbiology
Not in here: Fragrance, color, botanical extracts. It stings at this pH. Opaque airless pump; it turns orange when it is done.

α-tocopherol Evidence grade B

Outcome: Stabilises L-ascorbic acid and adds to photoprotection in combination.
Dose in the literature: 1 % alongside 15 % L-ascorbic acid and 0.5 % ferulic acid in the combination studies.
Our dose: 1 %.
Trials: Trial list pending. Each entry will carry PMID, n, duration, dose and effect size. Trials at lower doses listed with what they found. Negative trials listed.
Form: D-α-tocopherol.
Supplier: Published with the first lot.
Spec: Assay ≥ 96 %
Lot tests: Assay by HPLC
Not in here: —

Ferulic acid Evidence grade B

Outcome: Stabilises the vitamin C and E combination and roughly doubles photoprotection in the combination studies.
Dose in the literature: 0.5 % in the combination studies.
Our dose: 0.5 %.
Trials: Trial list pending. Each entry will carry PMID, n, duration, dose and effect size. Trials at lower doses listed with what they found. Negative trials listed.
Form: Ferulic acid.
Supplier: Published with the first lot.
Spec: Assay ≥ 98 %
Lot tests: Assay by HPLC
Not in here: —

§ 3

Testing

Latest lot 26-0918-C

Packed: 2026-09-18
Best by: 2026-12
Lab: Contract lab, named on release
Status: Illustrative

Test	Method	Spec	Result
L-ascorbic acid assay at fill	HPLC	15 % ± 0.5	Pending
pH at fill	Potentiometric	3.2 ± 0.1	Pending
Colour	Visual vs. standard	Colourless to pale straw	Pending
Preservative efficacy	USP <51>	Pass	Pending

Full certificate for lot 26-0918-C →

§ 4

Supply

Ingredient	Supplier	Origin	Form	Specification	Allergen statement
L-ascorbic acid	Pending	Pending	Powder, USP	≥ 99 %	None

Source documents publish with each released lot.

§ 5

Not in here

Fragrance and color: Sensitisers with no function at this pH.
Botanical extracts: Undosed, unstandardised, and there to lengthen the ingredient list.
“Preservative-free” claims: A low-pH aqueous product is self-preserving to a point; we test for it per lot rather than claim it.

§ 6

Cost

Published when the first lot is costed.

§ 7

Dispute

Submit a missed paper. Accepted disputes update the formula and credit you.

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