Ingredient | Dual-Soluble Antioxidant
Alpha-Lipoic Acid
INCI · Thioctic Acid
Related names and forms: Alpha-Lipoic Acid · ALA. This list does not indicate synonyms or exact ingredient matches.
Alpha-lipoic acid (INCI: Thioctic Acid; ALA) is an antioxidant described as dual-soluble, able to interact with both water and oil phases. This is why it is highlighted in marketing as a "universal antioxidant". Klaris takes a measured view: dual solubility is a practical formulation feature, not automatic superiority of effect. It is studied in the literature in relation to oxidative stress appearance. The INCI name Thioctic Acid is generic; the common cosmetic form is racemic (+/-)-alpha-lipoic acid, and this entry links to the generic record (CID 864). Records for individual enantiomers such as R-lipoic acid are distinct. It requires attention to pH and stability, and some users may report temporary tingling or warmth at high concentrations. It appears on labels as Thioctic Acid or Alpha-Lipoic Acid, and its generic PubChem record has been verified (CID 864, C8H14O2S2). Klaris considers ALA alongside concentration, stability context and companion antioxidants.
i. Cosmetic Functions
Frequently Discussed Effects
The following headings summarise areas of effect frequently discussed in the literature; visible results in each area require regular use and a suitable formula.
Dual-Phase Antioxidant
Solubility in both water and oil phases offers a broad range of interactions within the formula.
Oxidative Stress Appearance Context
Studied in the literature in relation to appearance associated with free radicals.
Surface Appearance
Discussed in formulas marketed for a smoother, more vibrant-looking surface.
Mechanism
What Happens Within the Skin?
The following points summarise mechanisms from dermocosmetic literature in plain English. Klaris presents them as background information to help readers understand the context, not as medical claims.
Step 1
Dual-Phase Water and Oil Antioxidant
Solubility in both water and oil phases offers a broad range of interactions in the formula. This is a practical feature, not automatic superiority of effect.
Step 2
Oxidative Stress Appearance Context
Studied in the literature in relation to appearance associated with free radicals.
Step 3
Generic Racemic Form
The INCI name Thioctic Acid is generic. The common cosmetic form is racemic (+/-)-ALA, and this entry links to the generic record (CID 864). R-lipoic acid is distinct.
Step 4
Attention to pH and Stability
An antioxidant that requires attention to pH and stability, generally formulated at low concentrations.
Step 5
Sensation at High Concentrations
Some users may report temporary tingling or warmth at high concentrations. Measured concentrations are considered more comfortable for sensitive profiles.
ii. Role in the Formula
How Is It Read on a Label?
Alpha-lipoic acid is an antioxidant that requires attention to pH and stability, and is generally formulated at low concentrations. Some users may report temporary tingling or warmth at high concentrations, so measured concentrations may be more comfortably tolerated by sensitive profiles.
A Closer Look · pH, Stability, Synergy
The most frequently highlighted feature of alpha-lipoic acid is dual solubility. Its ability to interact with both water and oil phases allows broad formulation use and underpins the marketing description "universal antioxidant". Klaris finds this interesting but takes a measured view: dual solubility is a practical advantage, not a guarantee of effect size on its own. The INCI name Thioctic Acid is generic. Racemic (+/-)-alpha-lipoic acid is commonly used in cosmetics, so the reference links to the generic record (CID 864). Records for individual enantiomers such as R-lipoic acid are distinct and are not equivalent to the generic INCI ingredient, following the same generic-matching rationale as lactic and tartaric acids. ALA requires attention to pH and stability and is generally formulated at low concentrations (0.5%-5%). A practical note: some users report temporary tingling or warmth at high concentrations. This sensation is not evidence of an effect; it is considered only in relation to concentration, and measured concentrations are more comfortable for sensitive profiles. When assessing an alpha-lipoic acid product, Klaris considers concentration, stability context and companion antioxidants as a whole.
Typical Concentration Range
Low concentrations (generally 0.5% - 5%)
Ingredient Family
Antioxidants
iii. Sensitivity Advisory
A Note on Extra Care in Context
Some skin may experience temporary tingling or warmth at high concentrations. Measured concentrations and a patch test may be helpful for sensitive profiles.
A sensitivity advisory is not an instruction for use; where individual health circumstances, pregnancy or known sensitivities are involved, discussing the decision with your doctor may be a more contextual approach.
Common Misconceptions
Frequently Confused Points
Common Belief
As a universal antioxidant, it solves everything or is the strongest.
A More Contextual Reading
Dual solubility is a practical formulation advantage, not automatic superiority of effect. The size of the cosmetic effect is considered through concentration, stability and the whole formula.
Common Belief
Tingling or warmth proves that ALA is working.
A More Contextual Reading
This sensation relates to concentration, not proof of an effect. Measured concentrations are more comfortably tolerated by sensitive profiles.
Common Belief
R-lipoic acid is always superior to generic ALA.
A More Contextual Reading
The INCI name Thioctic Acid is generic. Cosmetic behaviour is largely managed through concentration and stability. The source of the enantiomer alone is not an indicator of quality or superiority.
Common Belief
Dual solubility means there are no stability issues.
A More Contextual Reading
ALA requires attention to pH and stability. Dual solubility does not change that; the formula's stability design is decisive.
Scientific Basis
Sources and Their Scope
The following headings indicate areas of research; they are not citations of a specific publication or confirmation that every statement on this page has been verified. The links provided should be read with their individual scope in mind.
- International INCI / CosIng database
- Dermocosmetic research publications
- Formulation chemistry guides
Source Links
Database records provide ingredient identity and registration information; on their own, they do not establish the effect of a finished product or its suitability for a profile. Search links are not specific research papers.
iv. Related Ingredients
Ingredients Often Read Together
v. Antioxidants Family
Other Ingredients in the Same Family
Explore ingredients in the same functional family to deepen your reading of formulas.
vi. Academy · Related Reading
For a Closer Look
Klaris · Example Analyses
How Does Alpha-Lipoic Acid Feature
in Your Products?
Explore product examples to see the ingredient list, general assessment and match score that changes with the example profile together.
Masked products and example profiles, not a personal analysis. Profile matching in the app is part of Klaris Premium. The app is currently available in Turkish. An English version is in preparation.