Preservatives
Phosphoric acid
Definition
What it is
Phosphoric acid: synthetic acidulant linked to lower bone mineral density and dental enamel erosion with regular consumption.
On the label
How it appears on labels
- phosphoric acid
Regulation
Regulatory status
No bans or restrictions are recorded for this ingredient in the jurisdictions clearlabel tracks (US, EU, UK, Canada, Japan, Australia/NZ, Brazil).
Explainer
In plain language
Phosphoric acid is a synthetic acid used to make foods and drinks taste tangy and to keep them shelf-stable. Its most familiar job is giving cola its sharp bite, but it also acts as an acidity regulator in a range of processed products. It is produced industrially from phosphate rock.
Assessment
Why it is flagged
The main concerns are bone density and dental enamel. Some observational studies, including work associating cola intake with lower bone mineral density in women, have raised questions about whether the phosphate load or the displacement of milk in the diet is responsible. The evidence is mixed and the mechanism is still debated, so this is a correlation rather than a settled cause. Separately, phosphoric acid is acidic enough that regular sipping of cola is associated with dental enamel erosion in dental research. Clear Label flags it at low severity so heavy soda drinkers can see it and test their own patterns, not because harm at occasional intake is established.
In the aisle
Where it commonly shows up
- Cola and some other dark sodas
- Some flavored and sports drinks
- Processed cheese products
- Some bottled iced teas
- Certain bakery and jarred products as an acidity regulator
Practical
Reading the label
Phosphoric acid is usually listed by name in US ingredient lists and can appear as E338 in the EU. It shows up most reliably in cola-style sodas, so scanning your regular drinks is the quickest place to find it.
Alternatives
If you want to avoid it
Some people who want less of it choose sodas acidified with citric acid instead, or sparkling water with a squeeze of citrus. Water, coffee, or tea sidesteps the question entirely.
FAQ
Common questions
Is phosphoric acid banned anywhere?
No. It is broadly permitted as a food additive in the US, EU, Canada, and Australia. Regulators treat it as safe at the levels used in food and drink.
Does phosphoric acid weaken bones?
Some studies have associated frequent cola consumption with lower bone mineral density, but researchers disagree on whether the acid itself, the phosphate, or simply drinking cola instead of milk is behind the pattern. The evidence is not settled.
Why is it linked to tooth enamel?
Phosphoric acid makes drinks acidic, and dental research associates frequent exposure to acidic drinks with enamel erosion over time. How often and how long the drink stays in contact with teeth matters more than any single sip.
Citations
Sources
Citation
Primary reference
About this page: the definition, label names, severity, and regulatory chips come from the clearlabel ingredient taxonomy, the same data the scanner uses to score products. Research summaries describe associations reported in published studies, not diagnoses; individual responses vary. Scan any product with clearlabel to see which of its ingredients carry flags.