Don’t take our word for it. Here’s every fact on this site, with its evidence grade, its caveats, and a link to the source, so you can check us.
We start you on the strong ones: findings that have been replicated or come from one large, well-controlled study. Moderate and weak facts are here too, labeled for what they are. Use “Link to this fact” to share a single card.
What you can do / Government agency
As of 1998, EPA planned to expand its voluntary consumer-labeling initiative beyond pesticides to labels on household and other consumer products such as cleaning agents and latex paint, aiming to give clearer hazard information, especially for children.
Weak evidence.
Caveats
A stated 1998 plan/intention, not a completed program; the paper does not report whether or how it was implemented, and no fragrance-specific labeling requirement is described anywhere in the paper.
Source: Goldman 1998, Environmental Health Perspectives Link to this fact
What you can do / Other evidence
People should use scented candles with caution in closed spaces and should refrain from using them around vulnerable groups such as pregnant women, children, the elderly, and people with pre-existing cardiopulmonary conditions.
Weak evidence: A precautionary recommendation, not based on a candle-specific dose-response or exposure-outcome study in any of the named vulnerable groups.
Source: Singh 2023, Environmental Science & Technology Link to this fact
What you can do / Other evidence
Liquid homeopathic products for infants, young children, pregnant women, and immunocompromised people deserve extra caution; check FDA recall and warning-letter pages for the brand and lot.
Weak evidence: Derived from one firm's violations; it does not show that other makers' products are contaminated.
Source: FDA warning letter to King Bio, 20 Mar 2019, FDA warning letter (20 March 2019) Link to this fact
What you can do / Other evidence
Parabens are preservatives in cosmetics and personal care products; the evidence on children's attention is inconsistent across cohorts, so avoiding them is precaution under uncertainty, not a demonstrated protective step.
Weak evidence: Allergy side differs: parabens are the least sensitizing common preservative.
Source: Tung 2024, Environment International Link to this fact
What you can do / Review of other studies
Several small randomized trials of probiotics or synbiotics in children with ADHD report symptom improvement, but none enrolled children selected for chemical exposure, so they do not show that gut bacteria carry chemical effects.
Weak evidence: Small trials, some without microbiome measurement; relayed by the review without risk-of-bias scores in the main text.
Source: Wu 2026, Biological Psychiatry Global Open Science Link to this fact
What you can do / Other evidence
The OEHHA review concludes that the basis of the ADIs for Red 3, Red 40, Yellow 5 and Yellow 6 may not be adequate to protect neurobehavior in susceptible children, and calls for re-evaluating children's exposure and more research.
Weak evidence: A precautionary recommendation by a state agency; not all children react and no individual dye except tartrazine is isolated in trials.
Information, not medical advice. See also: myths we won’t tell you.