Zinc acetate
A zinc salt used to add zinc to foods such as infant formula and food supplements. It delivers zinc as a nutrient, not as a preservative or colour.
What is it?
Zinc acetate is the zinc salt of acetic acid. It appears as a white crystalline powder that dissolves readily in water. In food use it serves as a source of the essential trace mineral zinc rather than as a functional additive in the traditional preservative or texturiser sense.
What does it do?
It releases zinc ions when dissolved, supplying zinc to fortified foods. Zinc is required for hundreds of enzyme reactions in the body, including immune function, protein synthesis, wound healing, and normal growth. As a food additive, zinc acetate is chosen because it is highly water-soluble and the zinc it provides is well absorbed.
Where you will see it
Zinc acetate is permitted only in a narrow set of products: food supplements in tablet, capsule or liquid form; foods for special medical purposes (such as sip-feeds for hospital patients); infant formula and follow-on formula; and processed cereal-based foods for infants and young children. It does not appear in mainstream grocery products. On a UK label it appears as 'zinc acetate' or 'E650' in the ingredients list, or may be declared under the nutrition information as a zinc source.
What the science says
Zinc as an essential nutrient with an upper limit
Zinc is an essential trace mineral; deficiency causes immune failure, poor wound healing, and growth delay. However, chronic high intake from all sources can suppress copper absorption, leading to copper deficiency, anaemia, and neurological problems. EFSA set a tolerable upper intake level for zinc of 25mg per day for adults. In food supplements, zinc content per daily dose is regulated under Directive 2002/46/EC to stay within this range. At the levels used in fortified foods and supplements, intake from E650 alone is well within the upper limit for most people.
EFSA set a tolerable upper intake level (UL) for zinc of 25mg per day for adults, based on the risk of copper depletion at higher intakes.
Chronic zinc supplementation above the UL reduces copper absorption and can cause copper-deficiency anaemia and neurological impairment.
At high single doses (above about 50mg), zinc salts including zinc acetate can cause nausea, vomiting, and gastrointestinal irritation.
EFSA re-evaluation as a food additive
EFSA re-evaluated zinc acetate as a food additive under its programme to reassess all additives authorised before 2009. The panel confirmed that zinc acetate used in its permitted food categories poses no additional concern beyond the general zinc upper intake level, and that its use as a zinc source in supplements and fortified foods for infants is appropriate when total zinc intake stays within the tolerable upper level.
EFSA confirmed that zinc acetate (E650) is suitable as a zinc source in the permitted food categories and that no new safety concerns arose from its use as a food additive distinct from the established zinc UL.
Where it stands with the regulators
Who should be careful
People already taking high-dose zinc supplements should check total daily zinc intake from all sources does not regularly exceed 25mg. Infants fed formula containing zinc acetate are covered by the regulatory limits applied to that product category. Look for 'zinc acetate' or 'E650' in the ingredients list, or check the nutrition panel for zinc content per serving.
The honest read
Zinc acetate is a nutrient-delivery ingredient, not a chemical additive in the preservative or colour sense. Its safety profile is well understood because zinc itself is one of the most studied essential minerals. The debate that exists is not about zinc acetate specifically but about high-dose zinc supplementation in general, where the risk of copper depletion at doses well above normal dietary intake is established. In the narrow food categories where E650 appears, the amounts used are set to stay within the tolerable upper level, and the additive has been in regulated use across the EU for decades without emerging safety signals.
Related additives
Common questions
Is E650 banned in the UK?
No. Zinc acetate (E650) is an approved food additive in the UK and EU, permitted in food supplements, infant formula, foods for special medical purposes, and related categories.
Can too much zinc from products containing E650 cause problems?
Zinc has a tolerable upper intake level of 25mg per day for adults. Chronically exceeding this from supplements and fortified foods combined can deplete copper, potentially leading to anaemia. At the amounts found in individual regulated products, staying within that limit is achievable, but people taking multiple zinc-containing supplements at once should check their combined daily total.
What foods contain E650?
Zinc acetate is restricted to food supplements, foods for special medical purposes, infant formula, follow-on formula, and processed cereal-based infant foods. It does not appear in mainstream grocery products such as bread, drinks, or snacks.
Is E650 vegan?
Yes. Zinc acetate is produced synthetically from zinc oxide and acetic acid and contains no animal-derived ingredients.
Sources
- Approved additives and E numbers - Food Standards Agency
- EFSA Panel on Food Additives and Nutrient Sources Added to Food (ANS) - re-evaluation programme
- EFSA Scientific Opinion on Dietary Reference Values for zinc
- Institute of Medicine - Dietary Reference Intakes: Zinc chapter
- EU Food Additives Database - E650
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