Citric Acid
Natural acid used to lower pH. Also acts as a chelating agent and antioxidant synergist.
Last reviewed October 7, 2026 · Always verify against the current Health Canada Cosmetic Ingredient Hotlist before use.
Formulator's quick answer
Citric acid is a water-soluble acid used mainly to lower and fine-tune the final pH of water-based cosmetics. Formulators normally add it as a pre-diluted solution in small increments, measure again after thorough mixing, and confirm the finished product remains inside the preservative system's effective pH range.
Practical guidance
Citric acid can support product stability and preservation by helping a formula reach its target pH, but it is not a complete preservative system. Establish the target from the formula, preservative supplier documentation, packaging, and intended use rather than choosing a pH from the ingredient alone.
Prepare a known aqueous dilution so small corrections are easier to reproduce. Add gradually, mix completely, and record both the dilution strength and amount added. Recheck the batch after it has cooled because temperature and incomplete equilibration can change the apparent reading.
Use a calibrated pH meter suitable for the product rather than relying only on paper strips. A successful bench adjustment still needs stability testing, packaging compatibility work, and appropriate microbiological testing before sale.
Evidence trail
Editorial review: October 7, 2026
Sources support ingredient identity, regulatory checks, and formulation context. Supplier specifications and finished-product testing remain necessary for each formula and batch.
Pricing is for reference. Always confirm current price, lead time, and Certificate of Analysis directly with the supplier.
| Supplier | Location | Price/kg | Min Order |
|---|---|---|---|
| New Directions Aromatics | Mississauga, Ontario | $12 CAD | 0.5 kg |
| Voyageur Soap & Candle Company | Surrey, British Columbia | $14 CAD | 0.25 kg |
| Windy Point Soap Making Supplies | Calgary, Alberta | $13 CAD | 0.25 kg |
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FormulaNorth helps organize cosmetic formulation, label, costing, and CNF preparation information. It is not legal or regulatory advice and does not replace Health Canada guidance, professional regulatory review, or the maker's responsibility to verify product compliance before sale.