Below is every ingredient in Obagi Professional C Serum 20Percent Fast Absorbing explained, its standout actives, and the side effects reported in research for those actives — analysed for Indian skin.
Flags derived from the ingredient list using dermatology reference data (fungal-acne substrate, comedogenicity, EU allergens). General guidance, not a diagnosis.
Answers are derived from the printed ingredient list and dermatology reference data — general guidance, not a diagnosis or a therapeutic claim.
Ascorbic acid (vitamin C) is a water-soluble antioxidant used in skincare to neutralize free radicals, inhibit melanin synthesis, and support collagen production. It is valued for brightening, evening skin tone, and protecting against photodamage when used alongside sunscreen.
Ascorbyl Glucoside is a stable, water-soluble vitamin C derivative that is enzymatically converted to ascorbic acid in the skin, providing antioxidant protection and supporting collagen synthesis and skin brightening. It is generally considered milder and more stable than pure L-ascorbic acid.
Aggregated from the active ingredients in this product.
| Reported effect | How often | Notes |
|---|---|---|
| Mild skin irritation or stinging | Common | More likely at higher concentrations or on compromised/sensitive skin |
| Allergic contact dermatitis | Uncommon | Recognized contact allergen; confirmed via patch testing |
| Irritant contact dermatitis | Uncommon | Non-allergic irritation, often dose-dependent |
| Worsening of pre-existing eczema or barrier-impaired skin | Rare | Penetration-enhancing effect may increase reactivity |
| Systemic toxicity from topical use | Very rare | Reported mainly with extensive application on broken skin, especially in infants or burn patients |
| Irritation or sensitivity | Very rare | Purified water itself is essentially inert; rare reactions are attributable to contaminants or accompanying ingredients rather than water. |
| Transepidermal water loss aggravation in compromised skin | Rare | Evaporation of water from products may transiently increase dryness in very compromised skin barriers if occlusives are absent. |
| Mild stinging or tingling on application | Common | More likely at higher concentrations or low pH, and on sensitive or compromised skin. |
| Transient redness (erythema) | Uncommon | Usually temporary and resolves after acclimation or reducing frequency. |
| Dryness or skin irritation | Uncommon | Can occur with frequent use or in combination with other actives. |
| Yellow-orange skin staining from oxidized product | Rare | Caused by degraded (oxidized) formulations rather than the fresh active itself. |
| Skin dryness | Common | High concentrations can strip natural oils and reduce skin hydration. |
| Irritation or stinging | Common | Especially on compromised, sensitive, or freshly exfoliated skin. |
| Disruption of skin barrier | Uncommon | Repeated exposure may impair barrier function with frequent use. |
| Contact dermatitis | Rare | Irritant or allergic reactions reported in susceptible individuals. |
| Allergic contact dermatitis to ethanol itself | Very rare | True ethanol allergy is uncommon and documented in isolated cases. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
| Ingredient | What it does |
|---|---|
| Propylene Glycol Humectant / solvent | Propylene glycol is a small glycol molecule widely used in skincare as a humectant, solvent, and penetration enhancer that helps attract water and dissolve other ingredients. It is considered a base/formulation ingredient rather than a therapeutic active. |
| Aqua Solvent / vehicle | Aqua (water) is the most common base ingredient in skincare formulations, serving as a solvent that dissolves water-soluble components and forms the medium for emulsions. It has no direct treatment activity and primarily contributes to texture, spreadability, and product delivery. |
| Ascorbic Acid Key active Antioxidant / brightening active | Ascorbic acid (vitamin C) is a water-soluble antioxidant used in skincare to neutralize free radicals, inhibit melanin synthesis, and support collagen production. It is valued for brightening, evening skin tone, and protecting against photodamage when used alongside sunscreen. |
| Alcohol Denat Solvent/penetration enhancer | Alcohol Denat (denatured ethanol) is a volatile solvent used in skincare to dissolve other ingredients, improve product spreadability and absorption, and create a quick-drying, lightweight feel. It is a formulation aid rather than a therapeutic active. |
| Ascorbyl Glucoside Key active Antioxidant / vitamin C derivative | Ascorbyl Glucoside is a stable, water-soluble vitamin C derivative that is enzymatically converted to ascorbic acid in the skin, providing antioxidant protection and supporting collagen synthesis and skin brightening. It is generally considered milder and more stable than pure L-ascorbic acid. |
| Parfum Fragrance | Parfum (fragrance) is a blend of aromatic compounds added to cosmetic products to impart a pleasant scent or mask the base odor of other ingredients. It serves a sensory/formulation purpose rather than providing any skin benefit. |
| Amyl Cinnamal Fragrance ingredient | Amyl Cinnamal (amyl cinnamaldehyde) is a synthetic aromatic compound used as a fragrance and flavoring agent in cosmetics and personal care products to impart a floral, jasmine-like scent. It is one of the 26 fragrance allergens required to be declared on EU cosmetic labels. |
| Benzyl Benzoate Fragrance/Preservative/Solvent | Benzyl benzoate is a naturally occurring ester used in cosmetics as a fragrance component, solvent, plasticizer, and fixative; it also has antimicrobial and acaricidal properties. In medicine it is used as a topical treatment for scabies and lice. |
| Hexyl Cinnamal Fragrance ingredient | Hexyl Cinnamal is a synthetic aromatic compound used as a fragrance and masking agent in cosmetic and skincare formulations, valued for its mild floral, jasmine-like scent. It is one of the 26 fragrance allergens required to be labeled in the EU. |
| Limonene Fragrance/solvent | Limonene is a naturally occurring monoterpene derived from citrus peel oils, commonly used as a fragrance component and solvent in cosmetic formulations. On exposure to air it oxidizes, forming compounds with greater sensitizing potential. |
| Citrus Grandis (Grapefruit) Peel Extract Antioxidant / fragrance / skin-conditioning extract | Citrus Grandis (Grapefruit) Peel Extract is derived from grapefruit rind and is used in skincare for its antioxidant, astringent, and fragrant properties, contributing aromatic and conditioning benefits. It contains flavonoids, vitamin C, and limonene-rich volatile compounds. |
| Octoxynol-9 Surfactant/emulsifier | Octoxynol-9 is a nonionic surfactant and emulsifying agent used in cosmetic and topical formulations to solubilize ingredients, cleanse, and stabilize emulsions. It also has spermicidal and antimicrobial properties in some applications. |
Key active = does the main work. Ingredient explanations are drawn from public databases & literature.
Peer-reviewed papers on the active ingredients in this product, via PubMed.