Did You Know 'Natural' Food Colours Can React Too?
Carmine and annatto are natural food colours, but both can still trigger hives in some people, and carmine occasionally causes serious reactions. Why 'natural' does not mean non-allergenic, and which colours to know.
The fact, stated plainly
It is easy to assume the synthetic azo dyes are the only colours worth worrying about, and that “natural” colours are automatically safe. Not so. Carmine (E120, made from insects) and annatto (E160b, from a plant seed) are both natural, and both are recognised triggers of hives in some people, with carmine occasionally causing genuinely serious allergic reactions.
Why it happens
“Natural” tells you where a colour comes from, not how your body reacts to it. Carmine is extracted from cochineal insects, and it can carry residual insect proteins that a sensitive immune system may treat as allergens, which is why carmine, unusually for a colour, can provoke a true immune allergy rather than just a pseudo-allergic flare. Annatto, from the achiote seed, is a recognised if uncommon cause of hives and swelling. In both cases, the plant or animal origin does nothing to soften the response in someone whose skin reacts. So a colour can be entirely natural and still be the exact thing setting you off.
The word “natural” also does a lot of quiet reassurance work on packaging, which is part of the problem. Seeing it, or seeing “no artificial colours”, many people relax their label-reading precisely when they should keep it up, because carmine and annatto both qualify as natural and can sit happily under those claims.
Who it affects most
People whose skin reacts to food colours in general, and anyone with chronic hives linked to food additives. Carmine reactions are worth particular attention because carmine appears in both food and cosmetics, so someone can meet it from two directions, a pink yoghurt and a lipstick, and struggle to connect the dots. People who are careful about synthetic dyes but assume natural colours are fine are exactly the ones most likely to be caught out.
How to spot and avoid them on a label
- Learn the natural ones to watch: carmine, cochineal, carminic acid or E120, and annatto, E160b, bixin or norbixin.
- Check red, pink and orange foods in particular: some yoghurts, drinks, sweets, sauces and processed meats.
- For carmine, check cosmetics too, especially lipsticks, blushers and eyeshadows, where it is a common red pigment.
- Do not rely on “no artificial colours” claims, since carmine and annatto are natural and can still be present under that wording.
What to do about it
If colours flare your skin, learn the natural ones to watch (carmine, cochineal, E120, annatto, E160b) alongside the synthetic azo dyes, and check labels on both food and, for carmine, cosmetics. Swapping suspect products for uncoloured or differently coloured versions for a couple of weeks, while keeping a food-and-skin diary, usually makes any pattern clear. A fast or strong reaction to carmine deserves medical advice, as it can be a true allergy rather than a mild intolerance.
When to see a professional
See your GP if hives are frequent, persistent or hard to link to a cause, and a pharmacist can advise on anti-histamines for occasional flares. Because carmine can cause genuine allergy, any rapid, spreading or severe reaction to it, and especially any swelling of the lips, tongue or throat or difficulty breathing, is a medical emergency needing urgent care. A dermatologist or allergist can confirm a carmine allergy and advise on avoiding it across food and cosmetics.
Check it against your own list
A free database like Open Food Facts and Fig give broad ingredient information rather than a check against your own skin. A personal-list app like ClearaScan lets you save the natural and synthetic colours you react to and scan any product, food, medication or cosmetic, against your ingredient guard list, flagging only yours, useful since carmine spans food and make-up. Its Reaction Journal lets you tie a flare back to the product, a shared Care Circle lets family scan for you, and a Trusted Products list keeps what you have cleared. It is currently in early access. (Disclosure: our editor co-founded ClearaScan, and we are not paid to mention the others.)
The Sensitive Skin Ingredient Decoder
A free one-page guide to reading a skincare label fast: the irritants to watch, the fragrance loopholes, and what "fragrance-free" and "hypoallergenic" really mean.
Common questions
Which natural colours can cause skin reactions?
Carmine, also called cochineal (E120), made from insects, and annatto (E160b), from a plant seed, are the two best known. Both are recognised triggers of hives in some people, and carmine can occasionally cause more serious allergic reactions.
Why can a natural colour cause a reaction?
Natural describes where the colour comes from, not how your body responds to it. A plant or insect extract can carry proteins or compounds that a sensitive immune system reacts to, so natural origin is no guarantee of safety.
Where does carmine turn up?
Carmine appears in red and pink foods and drinks such as some yoghurts, juices, sweets and processed meats, and also in cosmetics like lipsticks and blushers. That is why it can catch people out across both food and make-up.
Is carmine allergy serious?
For most people carmine causes nothing, but in a minority it can trigger hives, and rarely more serious allergic reactions. A fast or strong reaction to carmine deserves medical advice, as it can be a true allergy.
How do I avoid these colours?
Read labels for carmine, cochineal, carminic acid or E120, and for annatto, E160b, bixin or norbixin. Check cosmetics as well as food for carmine, since it spans both.