Is Blue 1 Lake (ci 42090) safe in food and drink?
Cosmetics2 uses researched6 sourced claims
Where it turns up: blue pigment, cosmetic colorant, common. Detox My Life researched blue 1 lake (ci 42090) under 2 different uses, because the same substance means something different in each. Every claim below carries its evidence tier, how sure the research is that it applies here, and the sources it cites. The level is computed by the app's own deterministic engine, so the page says exactly what the app would.
Level by use and lens
Mainstream shows consensus claims only; Cautious adds emerging research; Based adds fringe claims, labelled as such. The last column counts, under Cautious, the sourced concerns, the findings in its favour and the fringe claims Based would add.
Safer swaps: the app's swap catalog has no entry tied to this ingredient yet. When you scan a product that contains it, the app suggests cleaner alternative types for that product; the swap categories list what the catalog covers today.
Eaten or drunk Watch
Under the default Cautious lens blue 1 lake (ci 42090) in food and drink rates Watch: worth watching; the app would list a cleaner alternative type. Mainstream (consensus only) rates it Watch; Based (adds the fringe) rates it Watch. Researched 2026-09-03.
Sourced concerns (4)
ConsensusIrritant · allergenconfidence 90%
Ingestion of blue 1 lake (ci 42090) can cause allergic reactions in sensitive individuals.
- Why here
- This is a direct physiological response to the ingested substance in susceptible individuals.
- What would have to be true
- Ingestion by sensitive individuals, even at regulated levels. Symptoms like hives, rashes, itchy skin, chest tightness, flushing, difficulty breathing, and severe headaches have been reported. Rare cases of blue discoloration of skin or urine have also occurred in clinical settings involving enteral feeding solutions.
Sources the engine cites (no regulator, review or study among them):
- 3 web articles (rupahealth.com, wikipedia.org, culinarysolvent.com), linked in the app.
- 1 community or commercial page, not counted here.
EmergingSuspected carcinogenconfidence 60%
Some rodent studies and in vitro experiments have indicated a potential link between high concentrations of ingested blue 1 lake (ci 42090) and cell changes or tumor growth.
- Why here
- This addresses the potential for the substance to contribute to cancer development through ingestion.
- What would have to be true
- High concentrations, as administered in rodent studies and in vitro experiments.
- The other side
- Regulatory agencies like the FDA and EFSA have concluded that blue 1 lake (ci 42090) is not carcinogenic when consumed within established safety limits.
Sources the engine cites (no regulator, review or study among them):
- 2 web articles (rupahealth.com, culinarysolvent.com), linked in the app.
- 1 community or commercial page, not counted here.
EmergingMetabolicconfidence 70%
Ingestion of blue 1 lake (ci 42090) is suggested by some studies to be linked to hyperactivity and ADHD symptoms in children.
- Why here
- This concern directly relates to the behavioral effects observed after the substance is consumed, particularly in children.
- What would have to be true
- Consumption of foods containing Blue 1, especially in large amounts by children. The EU requires warning labels on foods containing certain dyes due to this potential link.
- The other side
- Regulatory bodies like the FDA and EFSA consider it safe within established acceptable daily intake (ADI) limits, though they acknowledge ongoing debate and the need for more research.
Sources the engine cites (no regulator, review or study among them):
- 2 web articles (rupahealth.com, culinarysolvent.com), linked in the app.
EmergingMetabolicconfidence 60%
Animal studies and in vitro tests suggest that high doses of ingested blue 1 lake (ci 42090) may be linked to organ dysfunction and neurotoxicity.
- Why here
- This refers to the potential systemic effects on the body's organs and nervous system after the substance is ingested.
- What would have to be true
- High doses, as observed in animal studies and in vitro tests.
- The other side
- These findings have not been consistently replicated in humans at typical consumption levels, and regulatory agencies conclude it is safe within established limits.
Sources the engine cites (no regulator, review or study among them):
- 1 web article (rupahealth.com), linked in the app.
- 1 community or commercial page, not counted here.
On skin, left on Watch
Under the default Cautious lens blue 1 lake (ci 42090) on skin (left on) rates Watch: worth watching; the app would list a cleaner alternative type. Mainstream (consensus only) rates it Watch; Based (adds the fringe) rates it Watch. Researched 2026-09-03.
Sourced concerns (2)
ConsensusIrritant · allergenconfidence 90%
Blue 1 Lake (CI 42090) can cause skin irritation and redness in individuals allergic to dyes or with known skin sensitivities.
- Why here
- Direct and prolonged contact with the skin in leave-on cosmetic products can trigger allergic or hypersensitivity reactions in susceptible individuals.
- What would have to be true
- Individuals with pre-existing dye allergies or sensitive skin using products containing blue 1 lake (ci 42090).
Sources the engine cites:
EmergingTheoryconfidence 60%
In vitro studies have suggested that FD&C Blue No. 1 can inhibit neurite growth and may have neurotoxic effects, and animal studies suggest it may cross the blood-brain barrier and affect neurological functions, though these findings have not been replicated in humans at typical consumption levels.
- Why here
- While absorption through intact skin is generally low, potential for absorption through compromised skin (e.g., freshly shaven) or cumulative exposure over time could theoretically lead to systemic exposure.
- What would have to be true
- Regular application on compromised skin or long-term cumulative exposure to products containing blue 1 lake (ci 42090).
Sources the engine cites:
Not researched here
The engine has no dossier for blue 1 lake (ci 42090) when cooked with heat, in cold food, as a finishing ingredient, in heated food packaging or other uses. The app researches an ingredient for the use it infers from your product, so a scan fills these in; this page only shows what has already been researched and source-verified.
This is research, not medical advice. Detox My Life shows sourced claims sorted by evidence tier. It does not diagnose, treat, or tell you to start or stop anything. Talk to a qualified professional about your health.
Scan your own. The app reads any product label with your camera, works out how you are about to use it, and researches every ingredient for that use with live sources. Every scan adds to a Detox Score for your home, where 50 is a typical home in your region, and a plan of next swaps.
See also: all ingredients · paste a label to check it · how to read an ingredient flag
