Ingredient review

Ammonium Bicarbonate

INCI: AMMONIUM BICARBONATE

Ammonium bicarbonate is a synthetic pH adjuster that helps keep formulas stable, but it can be irritating at high concentrations and has a strong odor.

beautyskincarepH adjuster

In plain English

Ammonium bicarbonate is a white powder that smells a bit like ammonia. In skincare, it's used in tiny amounts to adjust how acidic or alkaline a product is. Think of it like a balancing tool — it helps other ingredients work better and keeps the formula from going too acidic or too basic. You won't usually see it listed high on the ingredient label because only a little is needed.

Quick decision guide

Useful, but context matters

Ammonium Bicarbonate can be useful, but watch for some irritation potential.

Plain-English read

Treat this as a practical screening step before you compare products that contain this ingredient.

Step 1Start with the score, then check the irritation and clogging risk before judging Ammonium Bicarbonate.
Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.

Score terms in plain English

Irritation risk

moderate

Can bother some users, especially with frequent use, damaged skin, or strong companion ingredients.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

Ammonium bicarbonate is an inorganic salt that forms when ammonia reacts with carbon dioxide. It's a common industrial chemical also used in baking as a leavening agent. In cosmetics, it's a pH adjuster and buffering agent.

How it works

When added to a water-based formula, ammonium bicarbonate dissolves and releases ammonia, which raises the pH (makes it more alkaline). It can also act as a buffer, meaning it helps maintain a stable pH even when other ingredients are added. This is important because the skin's natural pH is slightly acidic (around 4.5–5.5), and products that are too alkaline can disrupt the skin barrier.

Pros

Effective pH balancer

Ammonium bicarbonate quickly adjusts and stabilizes pH, helping other ingredients like exfoliating acids or preservatives work as intended.

Low comedogenic risk

It is unlikely to clog pores, making it suitable for acne-prone skin in properly formulated products.

Cons and cautions

Potential irritation

At higher concentrations or in leave-on products, ammonium bicarbonate can release ammonia, which may cause stinging, redness, or irritation, especially on compromised skin.

Unpleasant odor

The ingredient has a distinct ammonia smell that can be noticeable in some formulas, though it usually dissipates or is masked by fragrance.

Best for

People using well-formulated products where pH adjustment is needed
Those with normal, non-sensitive skin who tolerate a wide range of pH

Use caution if

Individuals with very sensitive skin, eczema, or rosacea
Anyone who notices stinging or irritation from ammonia-like ingredients

Usage tips

Look for ammonium bicarbonate near the end of the ingredient list — it's used in small amounts.

If you have sensitive skin, patch test a new product containing this ingredient before full use.

Avoid using products with this ingredient on broken or irritated skin.

Safety summary

Ammonium bicarbonate is considered safe for use in cosmetics at low concentrations. The main concern is irritation from ammonia release, especially in leave-on products or for sensitive individuals. Regulatory bodies like the Cosmetic Ingredient Review (CIR) have evaluated similar ammonium salts and found them safe when formulated to be non-irritating.

Research notes

Research on ammonium bicarbonate specifically in cosmetics is limited. However, studies on ammonium salts and pH adjusters indicate they are safe at low levels. The CIR has reviewed ammonium compounds and concluded they are safe for cosmetic use when formulated to avoid irritation.

Common label clues

Typical concentration: Typically less than 1% in leave-on products; higher in rinse-off products
Regulatory status: Ammonium bicarbonate is generally recognized as safe (GRAS) by the U.S. FDA for food use. In cosmetics, it is allowed in the EU and US with no specific concentration restrictions, but formulators are expected to ensure final products are non-irritating.
Common uses: Cleansers, Hair products, Formulas needing pH control
Environmental note: Ammonium bicarbonate is produced synthetically from ammonia and carbon dioxide. Its production has a moderate environmental footprint, but it is biodegradable and does not persist in the environment.

Good to know

Ammonium bicarbonate is not the same as baking soda (sodium bicarbonate) — they behave differently in formulas.
In rinse-off products like shampoos, the irritation risk is much lower because the ingredient is quickly washed away.

Common questions

What is Ammonium Bicarbonate in beauty products?

What does Ammonium Bicarbonate do in a beauty product?

Is Ammonium Bicarbonate safe for most people?

Who should be careful with Ammonium Bicarbonate?

Individuals with very sensitive skin, eczema, or rosacea Anyone who notices stinging or irritation from ammonia-like ingredients

Research sources

Cosmetic Ingredient Review (CIR) - Ammonium Compounds SafetyOpen PubChem - Ammonium BicarbonateOpen FDA - GRAS SubstancesOpen

Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.