| Echinacea purpurea/angustifolia | HMPC monograph, THMP | DSHEA — old ingredient | THR available | Pollen allergy warning |
| Ginseng (Panax ginseng) | HMPC monograph | DSHEA — old ingredient | THR available | Anticoagulant interaction warning |
| Saw palmetto (Serenoa repens) | HMPC monograph, THMP | DSHEA | THR available | Anti-androgen — male users only by precaution |
| Turmeric (Curcuma longa) | Food + supplement; high-dose >300 mg curcuminoids: hepatotoxicity warning per ANSES + Italian sales suspended 2019, returned 2020 with restriction | DSHEA — black-box warning emerging | Supplement; MHRA monitoring | Bile duct obstruction contraindication |
| Ashwagandha (Withania somnifera) | Food supplement most MS; Denmark + Sweden + Norway issued risk assessments 2020-2024 warning of thyroid + hepatotoxic risk + 17 case reports; FR limited 2024 | DSHEA | Supplement; MHRA monitoring | Pregnancy contraindication; thyroid + hepatic warning |
| St John's wort (Hypericum perforatum) | Well-established medicine in DE/AT; THMP elsewhere | OTC supplement; FDA warning on drug interactions | THR + POM (prescription strengths) | Major CYP3A4 inducer — contraceptive failure, immunosuppressant + antiretroviral interactions |
| CBD (Cannabidiol) | Novel food (since 2019 EFSA decision). UK + EU MS authorizing case-by-case. THC <0.2% (EU) or 0.3% (US) | Hemp-derived legal under 2018 Farm Bill (<0.3% THC). FDA: not approved as supplement — enforcement discretion. Epidiolex (purified CBD) is prescription drug | Novel food authorization required by FSA; >50 products under assessment | Heavy state variation US; Italy banned synthetic CBD 2023 |
| Kratom (Mitragyna speciosa) | NOT authorized as supplement; controlled in DK/SE/FI/LV/LT/PL/RO/IT (since 2016) | Federal: not scheduled but FDA import alert 54-15; State bans: AL, AR, IN, RI, VT, WI. Regulated supplement: TN, GA, KY, NV (KCPA) | Class B controlled (2024 update under Psychoactive Substances Act 2016) | High abuse + dependence potential |
| Kava (Piper methysticum) | Lifted EU ban in 2007 after WHO review; still restricted in UK, DE | Banned in some states; FDA consumer advisory | Banned for supplements; allowed traditional cultural use | Hepatotoxicity history |