That bright green in your chewing gum isn't "natural" — it's chlorophyll with copper
It's called E141, and it shows up in candy, canned vegetables and ice cream. Here's what we know — and don't — about its safety.
The short version
- E141 is modified natural chlorophyll: its magnesium is swapped for copper so the green color doesn't fade under heat or over time.
- It shows up in chewing gum, candy, canned vegetables, ice cream, sauces and drinks — wherever a stable, vivid green is needed.
- EFSA considers it low-risk, but in 2015 it withdrew the specific numerical daily intake limit (ADI) due to insufficient long-term absorption data.
What E141 actually is
Chlorophyll is the natural green pigment in plants, but it breaks down easily with heat, light or time — that's why cooked vegetables lose their bright green. To prevent that, the industry takes chlorophyll and swaps the magnesium atom at its center for copper. The result is a more stable colorant that survives industrial processing without fading: E141.
It isn't a chemical built from scratch in a lab — it's a modified derivative of a plant pigment. That's why many labels list it as "vegetable colorant" or "copper chlorophyllin" without it sounding like a synthetic additive.
Where it hides
It shows up in products where green needs to look vivid and even: chewing gum and candy, canned vegetables (like peas), mint or pistachio ice cream and yogurt, packaged pesto-style sauces, and some drinks. Look for it on the ingredient list as "E141", "INS 141", "copper chlorophyllin" or "copper complexes of chlorophyllin."
What the evidence says about its safety
The Joint FAO/WHO Expert Committee on Food Additives (JECFA) set an acceptable daily intake (ADI) of 0 to 15 mg per kg of body weight for copper-chlorophyll complexes years ago. But in 2015, after a review, EFSA concluded the available studies on its long-term absorption and toxicity were insufficient and withdrew that specific numerical limit — not because it found harm, but because more data is needed to confirm a precise limit.
In the meantime, it remains authorized in the EU under a "quantum satis" rule (only as much as needed for the color effect) and stays classified as low-risk. The one group with a specific caution are people with copper-metabolism disorders, like Wilson's disease, who should watch any extra copper source in their diet.
What to do with this information
E141 isn't the kind of additive that should keep you up at night — it comes from a natural pigment and is used in tiny amounts. But if you'd rather avoid additives with incomplete evidence, check the ingredient list before buying vividly green candy, canned vegetables or sauces, and favor versions without added coloring. And whenever you're unsure what's really in something before you eat it, scan it with CalorIA Scan and compare before you decide.
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- FAO/JECFA — Technical specification: Chlorophyllins, Copper Complexes Sodium and Potassium Salts (INS 141ii)
- EFSA — Scientific Opinion: re-evaluation of copper complexes of chlorophylls (E141i) and chlorophyllins (E141ii) as food additives (2015)
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This article is informational and not medical advice. Consult a doctor or registered dietitian before changing your diet, especially with a pre-existing condition.