Sodium Borate
What is Sodium Borate?
Sodium borate is the decahydrate sodium salt of boric acid, an inorganic compound derived from borate minerals found in evaporated lake beds and hot springs. It forms a white, odorless powder soluble in water. In cosmetics, it falls under inorganic pH regulators and is commonly incorporated into shampoos, cleansers, bath products, and eye lotions. It functions by dissociating into borate ions in solution, which help raise or stabilize pH levels in acidic mixtures, ensuring ingredient compatibility and formula longevity. As a buffering agent, it neutralizes acids or bases to prevent pH drift during storage or use. Its mild alkaline nature also contributes to antiseptic activity by creating an environment less favorable to certain microbes, while aiding emulsification in some water-based systems.
Roles in Formulation
This ingredient serves the following purposes in cosmetic formulations:
Benefits
Maintains stable pH for better ingredient performance and user comfort
Enhances preservative efficacy by optimizing formula conditions
Provides antiseptic properties to help control microbial growth
Who It's For
A quick guide for who this ingredient may suit (and who should be cautious).
| Who May Benefit | Who Should Avoid |
|---|---|
| Individuals using pH-sensitive cleansers or shampoos | Pregnant or breastfeeding individuals due to boron absorption concerns |
| Users of bath and body wash products for stable formulations | Children under three years old |
| People with normal skin seeking non-comedogenic options | Those with very sensitive or damaged skin |
Safety Notes
- EWG rates it as high concern for potential developmental and reproductive effects
- Safe in rinse-off cosmetics at typical low concentrations per cosmetic safety reviews
Frequently Asked Questions about Sodium Borate
What does sodium borate do in skincare?
It adjusts and buffers pH to stabilize products, supports ingredient function, and acts as an antiseptic.
Is sodium borate comedogenic?
It has a comedogenic rating of 0, meaning it does not clog pores.
Who should limit use of products with sodium borate?
Pregnant people, young children, and those with sensitive skin may want to avoid it.