
Formulator’s Queries, We Answered
1. What is Sodium Bicarbonate (INCI name) and what is its CAS number?
INCI name: Sodium Bicarbonate
CAS number: 144-55-8
Also known as sodium hydrogen carbonate or baking soda; chemical formula: NaHCO₃
2. What functions does Sodium Bicarbonate perform in personal care and cosmetic products?
Acts as a buffering / pH-regulating agent, helping to maintain or adjust the acidity/alkalinity of formulations.
Functions as a mild abrasive or exfoliating agent, often used in scrubs, toothpastes or cleansing products.
Used as a deodorant / odor-neutralizing agent or as part of deodorant and body-care formulations.
Helps in oral care (e.g. toothpaste, mouthwash) due to its abrasive and acid-neutralizing properties.
3. In what types of personal-care and cosmetic products is Sodium Bicarbonate commonly used?
Common application areas include:
- Toothpastes and mouthwashes (oral care)
- Deodorants and antiperspirants (or natural deodorant formulations)
- Body scrubs, facial scrubs, exfoliating cleansers, soaps and shower products
- Skin care creams, lotions, and cleansers — especially where buffering or mild exfoliation is desired
4. What are the potential benefits of using Sodium Bicarbonate in cosmetic formulations?
Gentle removal of dead skin cells (mild exfoliation), helping to smooth and refresh skin.
Neutralization or regulation of pH — which can make formulations milder on skin or stabilize the ingredients.
Odor neutralization or deodorizing effect — useful in deodorants or hygiene products.
In oral care, helps in mechanical cleaning of teeth and gums, neutralizing acid in the mouth, and supporting oral hygiene
5. Are there any safety or formulation considerations when using Sodium Bicarbonate?
Generally, Sodium Bicarbonate is not classified as a hazardous substance under many regulatory frameworks.
However, it may cause mild skin irritation or mild eye irritation, especially in concentrated form or on sensitive skin.
As an abrasive or exfoliant, overuse (too high concentration or frequent use) may be too harsh for sensitive skin — formulation and use frequency must be balanced.
When used in cleansing or rinse-off products, ensure proper rinsing to avoid residue.