open-formula Open Formula Vitamin C Serum (20% L-Ascorbic Acid)
open-formula Open Formula Vitamin C Serum (20% L-Ascorbic Acid) lists 15 ingredients on its label, 14 decoded. See what each one does, its irritancy and comedogenic tendency, and its status in national inventories.
Ingredients overview
Label order. Colour is our internal rating: green routine, yellow restricted or worth a look, red prohibited or high-risk, grey not yet decoded.
Ingredients are listed in label order; the order reflects the label only, not exact concentrations.
Highlights
Free of alcoholFree of fragranceFree of parabensFree of siliconesFree of sulfatesFree of mineral oilFree of essential oilsFree of formaldehyde releasersContains PEG
Key ingredients
- ANTIPLAQUE
- Water
- HUMECTANT
- EthoxydiglycolPropylene Glycol
- 抗氧化剂
- L Ascorbic Acid
- DENATURANT
- Glycerin
- ANTIOXIDANT
- Tocopherol
- ANTIMICROBIAL
- Ferulic Acid
- ANTISTATIC
- Panthenol
Other ingredients
Laureth-23TriethanolamineSodium HyaluronateSodium PCANiacinamidePhenoxyethanolEthylhexylglycerin
Skim through
| Ingredient | What it does | Irr. · Com. | Rating |
|---|---|---|---|
| Water | ANTIPLAQUE, SKIN CONDITIONING, SOLVENT | 0 · 0 | Green |
| Ethoxydiglycol | HUMECTANT, SOLVENT, PERFUMING · 限制 III/297 | 0 · 0 | Green |
| L Ascorbic Acid | 抗氧化剂, 美白剂, 皮肤调理剂 | 1 · 0 | Green |
| Propylene Glycol | HUMECTANT, FRAGRANCE, SOLVENT, VISCOSITY CONTROLLING, SKIN CONDITIONING - HUMECTANT, SKIN CONDITIONING - MISCELLANEOUS | 1 · 0 | Green |
| Glycerin | DENATURANT, HAIR CONDITIONING, HUMECTANT, ORAL CARE, SKIN PROTECTING, SOLVENT, VISCOSITY CONTROLLING, PERFUMING, FRAGRANCE, SKIN CONDITIONING - HUMECTANT | 0 · 0 | Green |
| Laureth-23 | Not decoded yet | — | — |
| Tocopherol | ANTIOXIDANT, FRAGRANCE, SKIN CONDITIONING - MISCELLANEOUS, SKIN CONDITIONING - OCCLUSIVE | 0 · 0 | Green |
| Ferulic Acid | ANTIMICROBIAL, ANTIOXIDANT | 0 · – | Green |
| Panthenol | ANTISTATIC, HAIR CONDITIONING, SKIN CONDITIONING | 0 · 0 | Green |
| Triethanolamine | BUFFERING, SURFACTANT - EMULSIFYING, FRAGRANCE, SURFACTANT - CLEANSING · 限制 III/62 | 2 · – | Yellow |
| Sodium Hyaluronate | HUMECTANT, SKIN CONDITIONING | 0 · 0 | Green |
| Sodium PCA | ANTISTATIC, HAIR CONDITIONING, HUMECTANT, SKIN CONDITIONING | – · 0 | Green |
| Niacinamide | SMOOTHING | 0 · 0 | Green |
| Phenoxyethanol | ANTIMICROBIAL, PRESERVATIVE · 限制 V/29 | 1 · 0 | Yellow |
| Ethylhexylglycerin | DEODORANT, SKIN CONDITIONING | 0 · 0 | Green |
Ingredients explained
- Water
- Primary solvent and base; requires preservative system to prevent microbial growth
- Ethoxydiglycol
- Ethoxydiglycol; high-perf solv/humectant; low irrit, EU limit 20%, watch total PEG load
- L Ascorbic Acid
- L-Ascorbic Acid (Vitamin C); potent antioxidant/whitener. Unstable; requires airtight, dark, cold storage. Can be irritating.
- Propylene Glycol
- Polyol humectant at 3-10%; hygroscopic, slight tackiness, mild irritation at high conc., verify preservative efficacy, no allergen.
- Glycerin
- Workhorse humectant at 3–10%; tacky at high levels, pair with occlusives
- Laureth-23
- Not decoded yet
- Tocopherol
- Natural antioxidant (vitamin E) at 0.1–1%; prone to oxidation, store protected from light
- Ferulic Acid
- Antioxidant, often combined with vitamin C and E; 0.5-2%, photolabile
- Panthenol
- Panthenol (vitamin B5) at 1–5%; moisturizing and reparative, supports barrier recovery
- Triethanolamine
- Triethanolamine for buffering; restricted, limit concentration to avoid high pH and irritation
- Sodium Hyaluronate
- Potent humectant at 0.1–2%; different MW for penetration depth, high levels may draw moisture
- Sodium PCA
- Sodium PCA, NMF component, 1-10% humectant; salty/tacky at high levels.
- Niacinamide
- Niacinamide at 2–5%; improves texture, controls oil, brightens; high levels may cause sensitivity
- Phenoxyethanol
- Broad-spectrum preservative at ≤1%; may irritate sensitive eye areas, often paired with ethylhexylglycerin
- Ethylhexylglycerin
- Mild conditioner and preservative booster at 0.5–1%; reduces preservative load, smooth feel
Source: full ingredient list published on the product label, collected 2026-09-19. Ratings are our internal reading, not a regulatory conclusion. · Product page
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