Is Citric Acid Bad for You? 10 Answers on E330 Safety, Grades and UK Limits

Key terms used in this Q&A

Citric acid is one of the most common additives on UK ingredient lists. Shoppers ask whether it is safe; formulators ask which grade to buy, how much they may add and what it does to the heat process. The ten answers below cover both, with the rule or study behind each point. This page is educational, not medical advice.

Table 1. Terms used in this Q&A

1. Is citric acid bad for you?

Short answer: not at the levels used in food, on the assessments regulators rely on. The FAO/WHO Joint Expert Committee on Food Additives (JECFA) set its acceptable daily intake as “not limited” in its latest toxicological evaluation (1973), and the EU Scientific Committee for Food set it as “not specified” in 1990.^[5][6] Two questions remain worth answering: its effect on teeth (Question 8) and a 2018 case series on manufactured citric acid (Question 9).

“Not specified” means that total intake, from citric acid’s natural occurrence in food and its use at the levels needed for a technological effect, was judged not to present a hazard to health.^[6] It does not mean any amount of any product is harmless, and it does not let a manufacturer add more than the recipe needs (Question 6).

Citric acid is also a normal part of the diet: it occurs naturally in citrus fruit and is the same molecule whether it comes from fruit or fermentation (Question 4).^[3] For how processing and additives fit into the wider debate on packaged foods, see our companion piece are canned foods healthy?; for another common additive reviewed the same way, see is maltodextrin bad for you?

2. Who has assessed citric acid's safety, and what did they conclude?

Short answer: JECFA, the former EU Scientific Committee for Food and, through the authorisation lists, the UK and EU regulators. All treat it as a low-concern additive. EFSA has citric acid in its re-evaluation programme, but we could not find a published EFSA opinion on E330 as of 6 November 2026.^[5][6][7]

Table 2. Safety and authorisation status of citric acid (E330)

Authorisation alone is not a licence to use it freely. Under Article 6 of Regulation 1333/2008, an additive may be used only where it raises no safety concern at the level used, meets a reasonable technological need and does not mislead the consumer.^[1] The UK framework is set out in our guide to shelf-stable ready meal regulations in the UK.

3. What is E330 and what does it do?

Short answer: E330 is the additive number for citric acid. JECFA lists four functions: acidulant, antioxidant synergist, sequestrant and flavouring agent.^[5] In practice it adds sourness, sets and holds pH, and binds trace metals that would otherwise speed up colour and flavour loss.

• Taste: a clean, sharp sourness used to balance sweetness in drinks, sauces and confectionery.
• pH control: lowering and buffering pH, which matters for microbial stability and, in shelf-stable foods, for the heat process (Question 10).
• Browning control: with ascorbic acid (E300), citric acid is used as a dip (the 2020 application described a solution of up to 1%) to limit enzymatic browning of cut vegetables, a use the European Commission extended in 2020.^[6]
• Metal binding: as a sequestrant it supports antioxidants in protecting fats, colours and flavours.^[5]

How these functions are traded off in a heat-treated recipe is covered in our pillar guide to retort food formulation.

4. Is citric acid natural, or is it made from mould?

Short answer: both. Citric acid occurs naturally in citrus fruit, but most commercial supply is made by fermentation. The legal specification allows it to be produced from lemon or pineapple juice, or by fermenting carbohydrate solutions with Candida yeasts or non-toxigenic strains of the mould Aspergillus niger.^[3]

A. niger is the main industrial organism for citric acid. After fermentation the acid is recovered from the broth and purified.^[8] Whatever the route, food-grade citric acid must meet the same specification: at least 99.5% citric acid on an anhydrous basis, with limits on water, ash, oxalates and heavy metals.^[3] The molecule (C₆H₈O₇) is the same as the acid in a lemon.

“Made with mould” therefore describes the production organism, not an ingredient in the food. Whether trace residues from the process matter to some people is the question raised by the 2018 case series in Question 9.

5. What is the difference between food-grade and technical-grade citric acid?

Short answer: food-grade citric acid is supplied against the E330 purity specification in Regulation 231/2012; technical or industrial grade is not, and should not go into food.^[3] Food grade comes in two forms, anhydrous and monohydrate, which behave differently in a recipe.

Table 3. Anhydrous vs monohydrate citric acid (E330)

Source: Regulation 231/2012, E330 specification.^[3]

• Switching forms: 1.094 g of monohydrate supplies the same acid as 1 g of anhydrous (210.15 ÷ 192.13, our calculation). Adjust the weight, or the pH and taste will drift.
• Dry blends: the monohydrate effloresces (loses water) in dry air, so formulators often prefer the anhydrous form for powders and tablets where moisture matters.^[3]
• Buying: ask the supplier for a certificate of analysis that states compliance with the E330 specification, and check it on each new lot or supplier.

6. What are the UK limits for citric acid in food?

Short answer: in most foods there is no number. Citric acid is a Group I additive, permitted at quantum satis in the categories where Group I additives are allowed.^[1][2] A few categories set a numeric maximum, and some foods may not contain additives at all, so check the product category in Annex II before you fix a level.

Table 4. Examples of citric acid conditions in Annex II

The figures above are from the Annex II entries as adopted in Regulation (EU) No 1129/2011, which form the basis of the assimilated GB text.^[2][1] Great Britain and Northern Ireland can now diverge: GB follows the assimilated regulation on legislation.gov.uk, Northern Ireland the current EU text.^[4] Confirm the category entry in the version that applies to your market before you sign off a label.

7. Why do manufacturers use citric acid?

Short answer: because one ingredient does several jobs. It sets taste, lowers and stabilises pH, supports antioxidants by binding metals and limits browning of cut produce.^[5][6] It also sets the acidity that pectin gels in jams depend on.

Lowering pH is one of the main “hurdles” that keep a product stable alongside water activity, preservatives and heat; our guide to hurdle technology explains how they combine. The legal test is the same for every use: a reasonable technological need that cannot be met by other practicable means, and no misleading of the consumer.^[1]

8. Can citric acid harm teeth?

Short answer: dietary acids, including the citric acid in fruit, juices, soft drinks and sour sweets, are associated with erosive tooth wear. A 2018 review in the British Dental Journal found that how often acids are consumed, particularly between meals, appears to be the main risk factor, more than the acid itself.^[10]

The same review notes that sipping acidic drinks slowly, or swishing or holding them in the mouth, increases the risk of progression, and lists fruit-flavoured drinks and acidic sugar-free sweets as less obvious sources.^[10] Not everyone who consumes dietary acids develops erosion. Anyone concerned about their teeth should speak to a dentist.

For product developers, the takeaway is that the sourness level and the way a product is consumed (sipped through the day versus eaten with a meal) both matter for drinks and confectionery positioned for frequent use.

9. Who should be cautious, and what about the 2018 case reports?

Short answer: people who have been told by a clinician to limit acidic foods should follow that advice. Separately, a 2018 case series raised the possibility that manufactured citric acid triggers inflammatory reactions in some people. It is a hypothesis from four case reports, not an established effect.^[9]

Sweis and Cressey (2018) described four patients with repeated respiratory symptoms, joint and muscle pain and irritable-bowel symptoms after eating foods, drinks or vitamins containing manufactured citric acid. They proposed that the manufacturing process, which mostly uses A. niger, may leave components that provoke inflammation in susceptible people, and called for studies to document its safety.^[9]

• What it shows: a signal worth investigating in a small number of individuals.
• What it cannot show: case reports have no control group, so they cannot establish that citric acid caused the symptoms or how common such reactions are.
• Regulatory position: we found no change in the JECFA, EU or UK status since 2018; the European Commission still relied on the 1990 assessment in 2020.^[5][6]

Anyone who suspects a reaction to a food should speak to a GP or other health professional rather than self-diagnose from a label.

10. How do formulators decide how much citric acid to add?

Short answer: by target pH, not by weight. Formulators titrate the recipe to the pH that gives the right taste, stability and process class, then fix the level and confirm the pH after processing and through shelf life. Under quantum satis, that level is also the legal ceiling: no more than the purpose needs.^[1]

For shelf-stable foods, pH decides the heat process. In the Codex code for canned foods, a low-acid food has a pH above 4.6 and a water activity above 0.85 and needs a heat process designed against Clostridium botulinum; an acidified low-acid food is one brought to an equilibrium pH of 4.6 or below.^[11] Adding citric acid can move a recipe across that line, but only a measured equilibrium pH in the finished product counts.

• Measure after processing: particulates (vegetables, pulses, meat) take time to equilibrate, so pH the blended product, not just the liquor.
• Check taste at the target pH: a lower pH may need sweetness or salt rebalanced, or a blend with a softer acid.
• Confirm on shelf: track pH in real-time and accelerated shelf-life testing.

Our pilot retort trial for soups and broths shows where this fits in a trial, and the retort food formulation guide covers recipe design for the process.

For brands & formulators

Most citric acid questions we see from brands are not about safety but about control: the wrong grade on a specification, a level fixed by weight rather than pH, or a label that does not match the category rules. FRL’s team in Chennai works with brands selling into the UK through pilot and contract food manufacturing and food and beverage product development:

• Acid system: citric, malic, lactic or a blend, chosen for taste, pH target and process.
• Grade and specification: anhydrous or monohydrate, with supplier certificates checked against the E330 specification.
• Category and label check: Annex II conditions for GB and Northern Ireland, reviewed by our regulatory and scientific research team.
• pH and process: equilibrium pH and shelf-life checks, which we run or arrange through accredited partner laboratories, and heat-process work through pilot retort trials.

Share your recipe, pack and target market and we will map the acid level, grade and rules that apply. Start with our food manufacturing service or contact us.

In this series

• Are canned foods healthy?: what the evidence says about canned and shelf-stable foods for UK shoppers.
• Retort pouch materials: the laminate layers, barriers and seals that make a pouch retortable.
• Retort food formulation (pillar guide): designing recipes that survive the heat process.
• Shelf-stable ready meal regulations in the UK: the hygiene, labelling and HFSS rules that apply.
• Pilot retort trial for soups and broths: how a pilot trial is run, step by step.
• Is citric acid bad for you? (you are here): safety, grades and UK limits for E330.
• Pilot and contract food manufacturing: FRL’s service page for taking a product from pilot to production.

1. European Parliament and Council. (2008). Regulation (EC) No 1333/2008 on food additives (assimilated law as it applies in Great Britain). legislation.gov.uk. https://www.legislation.gov.uk/eur/2008/1333/contents (cited for the quantum satis definition, Article 3(2)(h), and the conditions of use in Article 6).
2. European Commission. (2011). Commission Regulation (EU) No 1129/2011 amending Annex II to Regulation (EC) No 1333/2008 by establishing a Union list of food additives. Official Journal of the European Union, L 295, 1–177. https://eur-lex.europa.eu/eli/reg/2011/1129/oj (cited for E330 in Group I at quantum satis, Part A Table 1 foods without additives, and the category limits for fruit juices, fruit nectars, cocoa and chocolate products and foods for infants).
3. European Commission. (2012). Commission Regulation (EU) No 231/2012 laying down specifications for food additives listed in Annexes II and III to Regulation (EC) No 1333/2008 (assimilated law as it applies in Great Britain). legislation.gov.uk. https://www.legislation.gov.uk/eur/2012/231/contents (cited for the E330 definition and production routes, assay of at least 99.5%, water content of the anhydrous and monohydrate forms, molecular weights and purity limits).
4. Food Standards Agency. (n.d.). Approved additives and E numbers. https://www.food.gov.uk/business-guidance/approved-additives-and-e-numbers (cited for E330 on the GB approved list, its grouping with acids and acidity regulators, the FSA definition of quantum satis and the application of Regulation 1333/2008 in Northern Ireland).
5. Joint FAO/WHO Expert Committee on Food Additives. (1973; database entry accessed 6 November 2026). Citric acid (JECFA No. 218, INS 330). WHO JECFA database. https://apps.who.int/food-additives-contaminants-jecfa-database/Home/Chemical/3594 (cited for the ADI “not limited”, the group ADI with its salts and the functional classes).
6. European Commission. (2020). Commission Regulation (EU) 2020/1419 amending Annex II to Regulation (EC) No 1333/2008 as regards the use of ascorbic acid (E 300) and citric acid (E 330) on white vegetables intended for further processing. Official Journal of the European Union, L 326, 11–13. https://eur-lex.europa.eu/eli/reg/2020/1419/oj (cited for the 1990 SCF ADI “not specified” and its meaning, the pending re-evaluation, low-concern status, and the use of citric acid against enzymatic browning).
7. European Food Safety Authority. (2016). Call for technical data on the use of food additives (Batch 5) in the framework of Regulation (EU) No 257/2010. https://www.efsa.europa.eu/en/data/call/160524 (cited for E330 being in EFSA’s re-evaluation programme).
8. Behera, B. C., Mishra, R., & Mohapatra, S. (2021). Microbial citric acid: Production, properties, application, and future perspectives. Food Frontiers, 2(1), 62–76. https://doi.org/10.1002/fft2.66 (cited for Aspergillus niger as the main production organism and product recovery after fermentation).
9. Sweis, I. E., & Cressey, B. C. (2018). Potential role of the common food additive manufactured citric acid in eliciting significant inflammatory reactions contributing to serious disease states: A series of four case reports. Toxicology Reports, 5, 808–812. https://doi.org/10.1016/j.toxrep.2018.08.002 (cited for the four case reports, the authors’ hypothesis and their call for further study).
10. O’Toole, S., & Mullan, F. (2018). The role of the diet in tooth wear. British Dental Journal, 224(5), 379–383. https://doi.org/10.1038/sj.bdj.2018.127 (cited for frequency of dietary acid intake, especially between meals, as the predominant risk factor, sipping and holding drinks, and hidden acid sources).
11. Codex Alimentarius Commission. (1979, revised 1993). Code of hygienic practice for low and acidified low acid canned foods (CXC 23-1979). FAO/WHO. https://www.fao.org/fao-who-codexalimentarius/codex-texts/codes-of-practice/en/ (cited for the definitions of low-acid food, pH above 4.6 and water activity above 0.85, and acidified low-acid food, equilibrium pH 4.6 or below).