About
Flax seeds (Linum usitatissimum) are small whole oilseeds exceptionally rich in omega-3 alpha-linolenic acid (ALA), lignans, soluble dietary fiber, and plant protein. They are consumed whole, ground, or pressed into oil and are widely incorporated into breads, cereals, smoothies, and functional foods for their cardiovascular, digestive, and anti-inflammatory benefits.
Safety summary
Flax seeds contain cyanogenic glycosides (primarily linustatin and neolinustatin) that release hydrogen cyanide upon hydrolysis; however, at typical dietary intakes of up to approximately 15–20 g whole seeds per day the cyanide exposure for general adult consumers remains below the EFSA-established acute reference dose (ARfD) of 20 µg cyanide/kg body weight. The European Commission enacted binding maximum HCN limits of 150 mg/kg for retail-ready flaxseeds under Regulation (EU) 2022/1364, effective January 2023, to protect all consumer groups. Raw or unripe flaxseeds carry elevated cyanide risk and should not be consumed; higher doses may also cause gastrointestinal discomfort including bloating and diarrhea.
Regulatory landscape
| Jurisdiction | Status | Note |
|---|---|---|
| EFSA (European Food Safety Authority) (European Union) | Restricted | Commission Regulation (EU) 2022/1364 amends Regulation (EC) No 1881/2006 and sets maximum HCN (from cyanogenic glycosides) limits: 150 mg/kg for flaxseeds placed on market for final consumers; 250 mg/kg for unprocessed flaxseeds (whole, crushed, ground, split, chopped) not sold directly to consumers. EFSA ARfD for cyanide is 20 µg/kg body weight (EFSA CONTAM opinion, 2019). Flaxseeds are otherwise fully legal as food.source |
| FSSAI (Food Safety and Standards Authority of India) (India) | Approved | Flaxseed is a permitted food ingredient in India and is commercially sold without restriction. FSSAI has listed flaxseed among ingredients for which new compositional standards are being formally developed under its standards-formulation agenda; no ban or restriction is in force.source |
| FDA (Food and Drug Administration) (United States) | Approved | Flax seeds are sold as conventional food and dietary supplement ingredients in the US without restriction. Flaxseed oil is the subject of FDA GRAS notices (e.g., GRN No. 914 for ALA diacylglycerol oil derived from flaxseed). No FDA-mandated maximum level exists for whole flaxseeds; subject to general food safety provisions under 21 CFR.source |
Who should approach with care
Research citations
- 1PubMed. Flaxseed in Diet: A Comprehensive Look at Pros and Cons. pmc.ncbi.nlm.nih.gov
- 2other. Flaxseed and Flaxseed Oil: Usefulness and Safety. nccih.nih.gov
- 3other. Commission Regulation (EU) 2022/1364 of 4 August 2022 amending Regulation (EC) No 1881/2006 as regards maximum levels of cyanogenic glycosides in certain foods, 2022. eur-lex.europa.eu
- 4EFSA. Evaluation of the health risks related to the presence of cyanogenic glycosides in foods other than raw apricot kernels, 2019. efsa.europa.eu
- 5PubMed. Evaluation of the health risks related to the presence of cyanogenic glycosides in foods other than raw apricot kernels, 2019. pubmed.ncbi.nlm.nih.gov
