Neurological & behavioural — how we score

The Neurological & behavioural category is how NordicScan's method flags ingredients that research or regulators have associated with neurological or behavioural effects — additives, stimulants, and certain contaminants. It is one of the nine evidence categories behind a product's concern score. This page explains what the category looks at, the sources behind it, and what the score does and does not claim.

A flag in this category means an ingredient our method associates with neurological or behavioural signals is present — for your research. It is not a safety verdict, not a claim about your health, and not medical advice.

What this category looks at

• Food (ingestion). Stimulants (for example excess caffeine), certain synthetic colours, aspartame (which regulators require to carry a phenylalanine warning for people with phenylketonuria), high‑tyramine ingredients, and other additives that the literature has associated with attention or behavioural effects, especially in children.
• Cosmetic. Route‑adjusted: solvents, aerosols, and ingredients with meaningful systemic absorption, with particular attention to pregnancy and childhood exposure. Where the exposure route makes a neurological effect implausible, the category records a route reason rather than a flag.

The evidence and sources we weight

Per the source hierarchy, this category weights regulator assessments (for example EFSA and FDA opinions on caffeine and on the acceptable daily intake for aspartame) and the peer‑reviewed literature, including randomised‑controlled and observational studies on food additives and behaviour. Each ingredient‑level flag cites the specific source behind it.

The words we use

Every statement is matched to its evidence tier:

• A research finding is a correlation — "associated with attention or behavioural effects in children (observational and randomised studies)", named as an association, with the population and study type carried.
• An authority action is an authority / regulatory signal — for example, the EU flags certain colours (e.g. tartrazine, sunset yellow) with a mandatory on‑label warning that they "may have an adverse effect on activity and attention in children" (EU Regulation 1333/2008) — attributed to the named body and its exact wording.

A specific named neurological outcome is only ever rendered inside a fully framed, sourced, disclaimed statement — never as a bare label, and never as causation.

What the score does — and does not — claim

• It does flag ingredients that credible evidence associates with neurological or behavioural signals, so you can research them.
• It does not assess any condition, predict an effect on you, or attribute a neurological outcome to a product.
• Correlation is not causation; dose, individual sensitivity, and context all matter.

Related method pages

• How we score — the full method
• Allergens & sensitivities · Digestive · Metabolic · Endocrine‑active · Carcinogenicity signals · Cardiovascular · Skin (dermal) · Nutrition & positives

Disclaimer

Nordic Scan provides ingredient information and a concern score under our published method, for general consumer research. It is not medical advice and not a medical device, and does not diagnose, treat, cure, or prevent any disease, or determine the safety of any product. Decide for yourself.

NordicScan is operated by The Fred Group, Inc. (d/b/a NordicScan). See how we score for the full method.