Baking Soda (Sodium Bicarbonate)

• INCI: Sodium Bicarbonate
• Grade: USP (United States Pharmacopeia)
• Physical Form: Fine white powder
• Solubility: Water soluble
• Natural: Yes, all natural
• Shelf Life: 1 year
• Available Sizes: 2 oz sample through 2,750 lb bulk

• All-natural, USP grade sodium bicarbonate for bath bombs, body powders, and personal care formulations
• Natural alkaline that is believed to neutralize acids on the skin and assist in washing away oils and dirt
• Dissolves readily in water, making it easy to incorporate into a wide range of wet and dry formulations
• Produces a fizzing reaction when combined with citric acid, which is the fundamental mechanism behind bath fizzies and effervescent bath products
• Recommended for use at 85 to 95% in body powder applications and 66% in bath fizzy formulas
• Available for baking soda bulk purchase in formats suited for high-volume production
• Widely used by soap makers, bath product manufacturers, and personal care formulators

• Bath bombs and bath fizzies as the primary alkaline component paired with citric acid
• Body powders at usage levels of 85 to 95%
• Foot soak and bath soak formulations
• Natural deodorizing powder blends
• Home care and laundry formulations
• Cleaning product applications where a natural alkaline ingredient is needed

• Bath Fizzies: 66% of total formula weight
• Body Powders: 85 to 95% of total formula weight

Blend the desired amount into your formula as directed. Always test your final formulation for texture, performance, and fizz quality before scaling to full production.

Baking Soda has a shelf life of 1 year from the date of purchase when stored correctly. Store in a tightly sealed container in a cool, dry location away from moisture and humidity. Because sodium bicarbonate is hygroscopic and will absorb atmospheric moisture over time, keeping containers sealed between uses is especially important in humid climates or during warm seasons. For bulk baking soda stored in larger formats, label all containers clearly with the purchase date and transfer working amounts to a separate sealed container to minimize how often the bulk supply is exposed to air. Finished bath bombs made with this ingredient should be wrapped in airtight plastic wrap or sealed packaging immediately after demolding to prevent moisture absorption and preserve fizz performance.

For dry blended applications such as bath bombs and body powders, sift or blend sodium bicarbonate with other dry ingredients before adding any liquid or oil components. To minimize premature fizzing in bath bomb formulas, keep the baking soda and citric acid separate until the final blending stage and avoid introducing moisture during production. Work in a low-humidity environment where possible and fill molds promptly once the mixture is combined. For wet formulations such as bath soaks, sodium bicarbonate dissolves readily in water and can be added directly to the water phase.

The fizzing reaction in bath bombs is a straightforward acid-base neutralization reaction that produces carbon dioxide gas. Sodium bicarbonate is the alkaline component with a naturally high pH, while citric acid is the acidic component with a low pH. When both remain dry, they coexist in a formula without reacting. The moment water is introduced, it dissolves both compounds and allows them to interact, releasing carbon dioxide rapidly in the form of the bubbles consumers see and feel in the tub. Understanding this mechanism helps explain why keeping the two ingredients dry during production and storage is so critical to finished product performance.

The biggest practical challenge when working with sodium bicarbonate for bath bombs at production scale is premature activation caused by moisture. Because the fizzing reaction is triggered by water, even elevated humidity in a production environment can introduce enough atmospheric moisture to begin activating the baking soda and citric acid before the product is molded. This shows up as surface bumps, cracks, or bath bombs that expand in the mold. Working in a low-humidity environment, keeping ingredients in sealed containers until the blending stage, and introducing any liquid components via spray rather than pouring are the most effective ways to control this. For high-volume operations, running a dehumidifier in the production space is a widely recommended practice during bath bomb manufacturing.

For personal care and bath product manufacturing, the grade of baking soda matters. USP grade sodium bicarbonate meets the purity standards set by the United States Pharmacopeia, making it a more consistent and reliable choice for cosmetic and bath product applications than food or industrial grades. When sourcing baking soda by the bulk for use in products that contact the skin, USP grade provides greater confidence in purity and performance from batch to batch. For businesses evaluating a baking soda bulk purchase for large-scale bath bomb or body powder production, WSP's USP grade offering provides a dependable supply at competitive bulk pricing.

Did You Know?

The fizzing reaction in bath bombs is a simple acid-base chemistry reaction. Sodium bicarbonate (the alkaline component) reacts with citric acid (the acidic component) when introduced to water, releasing carbon dioxide gas that creates the characteristic fizz. Keeping the two ingredients dry and separate until just before use is the key to maintaining a strong, consistent fizz in finished bath products.

Baking Soda (Sodium Bicarbonate) is available in bulk baking soda formats suited for businesses at every stage of production, from small-batch makers developing new formulas through large-scale manufacturers filling at volume. As a foundational natural ingredient bath bombs, body powders, and bath soaks depend on, this USP grade sodium bicarbonate provides a reliable, all-natural alkaline ingredient for personal care product lines of any size.

What is the ratio of baking soda to citric acid for bath bombs?

The standard starting ratio for bath bombs is 2 parts sodium bicarbonate for bath bombs to 1 part citric acid by weight. At WSP's recommended usage rates, baking soda is used at approximately 66% of the total dry formula weight in bath fizzies. This ratio produces a reliable fizz reaction without excess citric acid, which can cause skin sensitivity, or excess baking soda, which can leave a powdery residue. Formulators should test batches and adjust as needed based on the specific fragrance oils, colorants, and additional dry ingredients in their formula.

What is the difference between baking soda and citric acid in bath fizzies?

Baking soda and citric acid serve complementary roles in bath fizzy formulas. Baking soda is the alkaline component, a natural ingredient bath bombs depend on for the base of the fizzing reaction. Citric acid is the acidic component that triggers that reaction when both come into contact with water. Neither ingredient fizzies on its own in a dry formula. It is only when water is introduced that the acid-base reaction occurs and carbon dioxide gas is released. Together, they create the effervescent experience that defines bath bombs and bath fizzies.

Can you use regular baking soda for bath bombs or do you need USP grade?

For personal care and bath products that come into contact with the skin, USP grade sodium bicarbonate is the recommended choice. USP grade meets established purity standards and provides greater consistency in performance and batch-to-batch reliability than food or industrial grades. Regular food-grade baking soda can technically produce the same fizzing reaction, but for professional production of bath and body products, sourcing a USP grade baking soda bulk purchase helps ensure product quality and supports more consistent formulation results.

Is baking soda safe for skin contact in bath products?

Baking soda is a widely used ingredient in personal care and bath products. It is a natural alkaline that is believed to neutralize acids and assist in cleansing the skin. As with any ingredient, individual skin sensitivities vary, and formulators should conduct appropriate safety and stability testing for their specific finished products before bringing them to market.

Is bulk ordering available?

Yes. This all-natural USP grade baking soda is available as a baking soda bulk purchase in multiple volume formats, from a 2 oz sample through quantities of 500 lb and 2,750 lb, making it a practical and cost-effective option for high-volume production environments and wholesale buyers.