Griffonia (5-HTP source)
Griffonia simplicifolia is a West African woody climber whose seeds are a natural source of 5-hydroxytryptophan (5-HTP), the immediate precursor to serotonin. Sold in the UK as a food supplement; no authorised UK food-supplement health claims. Serious interaction risk with serotonergic medication. Pregnancy: avoid.
Camden Medicals editorial · Last reviewed 3 May 2026 · Next review November 2026
- Cross-checked against
- NHS
- NICE
- BNF
- EFSA
- FSA
Camden's editorial team independently graded each health claim below on the strength of the published evidence — see the grade beside every condition.
- Class
- Botanical
- Typical daily dose
- Trials have used 100–300 mg of 5-HTP per day (in two or three divided doses) across 4–12 weeks. UK retail products supply 50–200 mg of 5-HTP per serving. Camden NB-412 supplies Griffonia Seed Extract 20:1 at 175 mg per capsule (declared <30% 5-HTP; up to ~52 mg of 5-HTP per capsule), 2–4 capsules daily.
- Top use evidence
- Limited
On this page
What it is
Griffonia simplicifolia is a woody climber native to the savannah and forest regions of West and Central Africa (Ghana, Côte d''Ivoire, Togo). It is a perennial in the Fabaceae (legume) family, growing 3–5 metres tall. The seeds — small, dark, and bean-like — are the part used in modern food supplements. They were studied in the 1980s as a natural source of 5-HTP after Japanese, French, and Italian researchers identified the seed coat as containing 5-hydroxytryptophan in concentrations of roughly 5–20% by weight, depending on the standardisation route.
5-HTP (5-hydroxytryptophan) is the immediate biochemical precursor to serotonin (5-hydroxytryptamine, 5-HT) — a neurotransmitter and signalling molecule with central nervous system, gastrointestinal, and platelet roles. Unlike its precursor L-tryptophan (which is used by the body to make several other compounds including niacin and protein), 5-HTP feeds almost exclusively into the serotonin pathway.
UK retail products typically supply 5-HTP either as Griffonia seed extract standardised to a stated 5-HTP percentage (e.g. "Griffonia Seed Extract 20:1, <30% 5-HTP" — Camden NB-412 uses this form) or as isolated 5-HTP powder filled into capsules. The isolated form may originate from Griffonia seed extraction or from synthetic / bacterial-fermentation routes; sourcing transparency is the relevant quality marker.
Regulatory note: Griffonia simplicifolia seed and 5-HTP from Griffonia are lawful UK food supplements. There are no authorised UK food-supplement health claims for either Griffonia or 5-HTP — botanicals are on EFSA hold and 5-HTP itself has no authorised claim. Mood / sleep / appetite / weight management framing on UK food supplements is not permissible.
At a glance
- A West African woody climber (Griffonia simplicifolia, family Fabaceae); the seeds naturally contain 5-HTP (5-hydroxytryptophan), the precursor to serotonin.
- No UK-authorised food-supplement health claims. Mood / sleep / appetite framing is not permissible.
- Standardisation by 5-HTP percentage is the relevant quality marker. Camden NB-412 supplies Griffonia Seed Extract 20:1 at <30% 5-HTP (~52 mg 5-HTP per capsule).
- Serious interaction risk with serotonergic medication — SSRIs, SNRIs, MAOIs, tramadol, triptans, lithium, St John's Wort. Talk to your prescriber before use.
- Historic eosinophilia-myalgia syndrome (EMS) outbreak in 1989 was traced to contaminated bacterial-fermentation tryptophan, not Griffonia-derived 5-HTP. CoA + heavy-metal screen are still the right hygiene.
What people use it for
Adults exploring supplements alongside lifestyle measures, with awareness of regulatory and interaction limits
Small short trials of 5-HTP (typically 100–300 mg/day across 4–12 weeks) have reported various self-reported endpoints. UK food-supplement claims for mood, sleep, appetite, or weight management are not permissible. Anyone considering 5-HTP must screen for serotonergic medication interactions first — talk to a prescriber if you take any prescribed medication.
Some evidenceLimitedAdults with diagnosed depression, anxiety, OCD, fibromyalgia, or migraine considering 5-HTP
5-HTP is not a UK NHS / NICE pathway for any of these conditions. NICE NG222 (depression in adults), CG113 (generalised anxiety / panic), CG159 (OCD / BDD), CG78 (fibromyalgia management), and CG150 (migraine) apply. Self-supplementation in place of formal assessment and management is not appropriate. Talk to your GP. [1,6]
Popular, not provenInsufficientAdults already taking serotonergic prescription medication (SSRI, SNRI, MAOI, tramadol, triptans, lithium)
Do not start 5-HTP without prescriber review. Serotonin syndrome (potentially life-threatening) is a real risk when serotonergic agents are combined; Griffonia / 5-HTP supplementation in this context is not the appropriate pathway.
Popular, not provenInsufficientAdults exploring traditional West African botanicals
Griffonia has a long traditional-use history in West African herbal practice. Traditional-use framing is permissible; specific UK food-supplement health claims are not authorised.
Some evidenceLimited
How it works
5-HTP crosses the blood-brain barrier (unlike serotonin itself) and is converted to serotonin by aromatic L-amino acid decarboxylase (AADC) in the brain and periphery. The mechanism framing is biochemically accurate but supports no authorised UK health claim; 5-HTP is positioned as a serotonin precursor in pharmacology textbooks, not as an authorised food-supplement ingredient with a permitted claim.
Common myths
Myth"5-HTP is a "natural antidepressant""
RealityIt is not a UK-licensed antidepressant and is not on UK NHS / NICE pathways for depression. The "natural antidepressant" framing is marketing language, not clinical equivalence. UK NG222 lists the licensed pharmacological options for depression management. Self- supplementation in place of licensed treatment for diagnosed depression is not appropriate. [1]
Myth"5-HTP works the same day you take it"
RealityTrial endpoints in the small studies that exist emerge across days to weeks, not the first dose. The acute / single-dose self-report effects in the literature are modest and inconsistent. Marketing implying same-day sleep or mood effects is not supported by the trial protocols.
Myth"You can combine 5-HTP with SSRIs / antidepressants for stronger effect"
RealityDo not. Combining serotonergic agents is the mechanistic recipe for serotonin syndrome — agitation, confusion, rapid heart rate, high blood pressure, fever, sweating, muscle rigidity, and in severe cases seizures or death. UK BNF interactions documentation lists 5-HTP as a serotonergic agent. Talk to your prescriber before any combination.
Myth"5-HTP is unsafe because of the 1989 EMS outbreak"
RealityThe 1989 outbreak was traced to L-tryptophan from a single Japanese manufacturer (Showa Denko) using a bacterial- fermentation process. The contaminants ("Peak E", "Peak X") were the cause, not 5-HTP itself. Subsequent investigations confirmed that Griffonia-derived 5-HTP from reputable suppliers with disclosed CoA + heavy-metal + contaminant screening is not associated with EMS. The hygiene markers are the relevant safety lever, not the molecule itself.
Myth"5-HTP is a "natural Prozac""
RealityProzac (fluoxetine) is a Prescription-Only SSRI antidepressant with defined pharmacology, dose-response, and prescribing rules. 5-HTP is a serotonin precursor food supplement with modest, inconsistent self-report trial endpoints and no UK-authorised health claim. The "natural Prozac" framing is marketing, not clinical equivalence.
Myth"Higher 5-HTP doses are always better"
RealityDose-response with 5-HTP is not linear and adverse-event rates rise at higher doses (notably GI upset and headache, rarely dyskinetic side effects). UK retail products typically supply 50–200 mg per serving from Griffonia extract. Camden NB-412 supplies up to ~52 mg 5-HTP per capsule with a 2–4 capsule daily range. Take with the lowest effective dose; reassess at 4–6 weeks.
Common online questions
Synthesised from the questions UK shoppers most often ask online about Griffonia (5-HTP source). Each answer is editorial and links to its evidence in the Sources list below.
Is Griffonia / 5-HTP legal to buy in the UK?
Yes. Griffonia simplicifolia seed and 5-HTP derived from it are lawful UK food supplements. There are no authorised UK food-supplement health claims for either Griffonia or 5-HTP, so retail framing as a mood / sleep / appetite supplement is not permissible. The MHRA has not classified 5-HTP as a medicine in the UK at the time of writing. Some other jurisdictions (e.g. Australia, New Zealand) restrict 5-HTP more tightly.
Is Griffonia 5-HTP the same as the synthetic 5-HTP I can buy abroad?
Biochemically, the active molecule is the same 5-HTP either way. Quality and contaminant profile differ depending on sourcing. Griffonia seed extract derives 5-HTP from a natural plant source; isolated synthetic or bacterial-fermentation 5-HTP is produced industrially. The 1989 EMS outbreak was traced to contaminated bacterial-fermentation tryptophan, not Griffonia-derived 5-HTP — but consumer-hygiene markers (CoA, heavy-metal screen, contaminant screen) apply to all sources. Camden NB-412 specifies Griffonia Seed Extract 20:1 sourced via the Troo Health Care broker; CoA is archived per batch.
Can I take 5-HTP if I'm on antidepressants?
Talk to your prescriber first — do not self-combine. SSRIs (sertraline, fluoxetine, citalopram, etc.), SNRIs (venlafaxine, duloxetine), MAOIs (phenelzine), tramadol, triptans (sumatriptan, etc.), lithium, dextromethorphan, and St John''s Wort all act on serotonin handling. Adding 5-HTP raises serotonin synthesis upstream and can produce serotonin syndrome — a potentially life-threatening condition. Disclose any supplement to your prescribing GP or pharmacist before adding.
Is 5-HTP a UK-recognised antidepressant?
No. UK NICE NG222 lists NHS pathways for depression in adults — these include talking therapies (CBT, BAS, IPT-A, etc.), exercise interventions, and licensed antidepressant medication where appropriate. 5-HTP is not on those pathways. Self-supplementation for diagnosed depression is not appropriate; talk to your GP. [1]
Can I take 5-HTP while pregnant or breastfeeding?
No. Standard advice is to avoid 5-HTP / Griffonia in pregnancy and lactation. There is no human pregnancy or lactation safety data, and the maternal-fetal serotonin axis is well-characterised as sensitive. The Camden NB-412 label carries this contraindication. If you are trying to conceive, talk to your GP before using.
Can I give 5-HTP to my child or teenager?
No. Camden does not retail Griffonia / 5-HTP for paediatric use; the NB-412 label specifies adults only. Paediatric depression / anxiety / sleep concerns are NHS / CAMHS pathway-managed, not self-supplemented.
🔬 Camden’s evidence review
The research Camden reviewed, graded on its strength. This is our own appraisal — it sits beneath the official guidance above, never above it.
Self-reported low mood — short-term
LimitedEvidencelimitedOlder small trials of 5-HTP 100–300 mg/day across 4–6 weeks have reported reductions in self-reported low-mood scale scores in some populations. Trials are small, dated, and often used active-comparator (not always placebo) designs. UK NICE NG222 lists NHS pathways for depression management; 5-HTP is not on those pathways. Authorised UK food-supplement claims for mood are not permitted. [1]
Sleep / sleep-onset latency — short-term
LimitedEvidencelimitedSmall trials of 5-HTP 100–200 mg in the evening have reported modest reductions in self-reported sleep-onset latency in some populations. UK NHS pathways for insomnia (sleep hygiene, CBT-I, short-term z-drugs under prescriber oversight) apply. 5-HTP is not on UK NICE pathways for insomnia. No authorised UK claim. [7]
Appetite regulation in obesity / overweight
LimitedEvidencelimitedSmall trials of 5-HTP 200–900 mg/day have reported reductions in self-reported appetite scores and/or modest changes in body weight. Trial sizes are small, durations short, and meta-analytic conclusions are limited. NICE NG246 (overweight and obesity management) lists NHS pathways; 5-HTP is not a recognised pathway. No authorised UK claim. [8]
Migraine prophylaxis (historical)
LimitedEvidencelimitedOlder trials in migraine prophylaxis reported some reductions in headache frequency / intensity. UK NICE CG150 lists first-line migraine prophylaxis options (propranolol, topiramate); 5-HTP is not among them. Self-supplementation for migraine is not the recognised UK pathway. [9]
Eosinophilia-myalgia syndrome (EMS) — historical safety signal
MixedEvidencemixedIn 1989 a multi-state outbreak of EMS in the United States was traced to L-tryptophan (not 5-HTP) supplements made by a single Japanese manufacturer (Showa Denko) using a bacterial-fermentation process. Subsequent investigation identified contaminants ("Peak E", "Peak X") in the affected batches as the most likely cause; some case reports in the 1990s also surfaced for 5-HTP supplements with contaminant signals. Modern Griffonia-derived 5-HTP from reputable suppliers with disclosed CoA + heavy-metal screen + contaminant screen is not associated with EMS, but the historical signal informs the consumer-hygiene framing around quality markers.
Combination with serotonergic medication — interaction risk
MixedEvidencemixedSerotonin syndrome (a potentially life-threatening condition of serotonergic over-stimulation) has been reported in case reports when 5-HTP was combined with SSRIs, SNRIs, MAOIs, tramadol, triptans, lithium, St John's Wort, and other serotonergic agents. The biological plausibility is direct — 5-HTP raises serotonin synthesis upstream of the agents modulating serotonin handling. UK BNF interactions documentation supports the conservative position of not combining without prescriber oversight.
Safety
5-HTP from Griffonia is generally well-tolerated in healthy adults at standard supplement doses for short durations. Serious interaction risk with serotonergic prescription medication — talk to your prescriber. Pregnancy, lactation, paediatric use: avoid. Adults with diagnosed depression or anxiety should follow NHS / NICE pathways, not self-supplement.
Talk to your pharmacist or GP first if you:
- You take any antidepressant — SSRI (sertraline, fluoxetine, citalopram, escitalopram, paroxetine), SNRI (venlafaxine, duloxetine), MAOI (phenelzine, moclobemide), tricyclic, or atypical (mirtazapine, trazodone). Risk of serotonin syndrome.
- You take tramadol, methadone, or any opioid — risk of serotonin syndrome with tramadol; opioid sedation may compound 5-HTP drowsiness.
- You take triptans (sumatriptan, zolmitriptan, etc.) for migraine — risk of serotonin syndrome.
- You take lithium — risk of serotonin syndrome.
- You take dextromethorphan (cough medicines) — risk of serotonin syndrome.
- You take St John's Wort — risk of serotonin syndrome.
- You take carbidopa or any Parkinson's medication — case reports of dyskinetic effects when carbidopa is combined with 5-HTP.
- You take any sedative, hypnotic, or anxiolytic — possible additive CNS effects.
- You are pregnant, breastfeeding, or trying to conceive — avoid.
- You are under 18 — avoid.
- You have a diagnosis of depression, anxiety, OCD, fibromyalgia, or migraine — talk to your GP; UK NHS / NICE pathways apply.
Common side effects: GI complaints (nausea, abdominal discomfort, loose stools, decreased appetite) are the most common; substantially reduced by lower starting dose. Headache and drowsiness can occur.
Pregnancy and breastfeeding
Pregnancy: avoid. No human pregnancy safety data; the maternal-fetal serotonin axis is well-characterised as sensitive to disruption.
Lactation: avoid. No human lactation safety data.
Talk to your GP, midwife, or pharmacist before starting any supplement during pregnancy or breastfeeding.
More clinical detail (for clinicians and informed readers)
Contraindications
- Pregnancy — avoid (no human safety data; serotonin axis is sensitive).
- Lactation — avoid.
- Paediatric use — avoid.
- Active SSRI / SNRI / MAOI / tricyclic / atypical antidepressant therapy — avoid combination without prescriber oversight.
- Active triptan / tramadol / lithium / dextromethorphan / St John's Wort use — avoid combination.
- Active Parkinson's disease therapy with carbidopa — avoid combination (dyskinetic-effect case reports).
- History of serotonin syndrome from any cause.
- Active or recurrent mania / hypomania.
Drug interactions
- SSRIs (sertraline, fluoxetine, citalopram, escitalopram, paroxetine, fluvoxamine) — risk of serotonin syndrome.
- SNRIs (venlafaxine, duloxetine) — risk of serotonin syndrome.
- MAOIs (phenelzine, isocarboxazid, tranylcypromine, moclobemide) — risk of serotonin syndrome; avoid.
- Tricyclic antidepressants (amitriptyline, dosulepin, lofepramine, etc.) — possible additive serotonergic effects; talk to prescriber.
- Atypical antidepressants (mirtazapine, trazodone) — possible additive serotonergic effects.
- Tramadol, methadone, fentanyl, pethidine — serotonergic activity at clinical doses; risk of serotonin syndrome.
- Triptans (sumatriptan, zolmitriptan, rizatriptan, almotriptan, eletriptan, frovatriptan, naratriptan) — serotonergic activity; risk of serotonin syndrome.
- Lithium — risk of serotonin syndrome.
- Dextromethorphan (over-the-counter cough medicine) — serotonergic activity; risk of serotonin syndrome.
- St John's Wort (Hypericum perforatum) — serotonergic activity; risk of serotonin syndrome.
- Carbidopa — case reports of dyskinetic effects when combined with 5-HTP.
- Sedatives, hypnotics, anxiolytics — possible additive CNS effects.
This is not an exhaustive list. Always tell your prescriber and pharmacist about every supplement you take.
Common side effects
- GI complaints — nausea, abdominal discomfort, loose stools, decreased appetite. Substantially reduced by starting at the lower end of the dose range.
- Headache.
- Drowsiness — particularly at higher doses or evening dosing.
Rare side effects
- Allergic reactions — uncommon.
- Dyskinetic effects — case reports in literature, particularly when 5-HTP is combined with carbidopa.
- Hypomanic / activation symptoms in vulnerable individuals — case reports.
- Serotonin syndrome — when combined with serotonergic medication; potentially life-threatening, requires emergency medical attention.
How to take it
- Typical supplemental range
- Trials have used 100–300 mg of 5-HTP per day (in two or three divided doses) across 4–12 weeks. UK retail products supply 50–200 mg of 5-HTP per serving. Camden NB-412 supplies Griffonia Seed Extract 20:1 at 175 mg per capsule (declared <30% 5-HTP; up to ~52 mg of 5-HTP per capsule), 2–4 capsules daily.
- Timing
- Either on an empty stomach or with a carbohydrate-only snack to avoid amino-acid competition for blood-brain-barrier transport. Evening dosing is the most common pattern in sleep-context literature.
How to spot quality
Look for
- 5-HTP percentage declared on the label (e.g. "<30% 5-HTP" — Camden NB-412 declares this).
- Source: Griffonia simplicifolia seed extract (preferred) or clearly-labelled isolated 5-HTP with sourcing disclosure.
- Country of cultivation declared (Ghana, Côte d'Ivoire, Togo are the principal Griffonia origins).
- CoA available on request, with batch number and issue date.
- Heavy-metal screening + contaminant screening disclosed.
- GMP-certified manufacture; reputable supplier chain.
- Pregnancy contraindication printed on the label.
- Serotonergic-medication interaction warning printed on the label (SSRIs, SNRIs, MAOIs, tramadol, triptans, etc.).
Red flags
- No 5-HTP percentage declared — extract ratio (e.g. "20:1") alone is not a comparable marker.
- No country-of-origin disclosure; opaque Chinese-only supply chain without CoA.
- No heavy-metal or contaminant screening disclosed.
- "Natural antidepressant", "natural Prozac", or "depression remedy" framing on label or PDP.
- Sleep / mood / appetite / weight-loss claims (botanical / serotonin-precursor on EFSA hold).
- No serotonergic-medication interaction warning.
- No pregnancy contraindication.
- Paediatric marketing or formulation.
- High-dose tablets (>300 mg of 5-HTP per serving) without dose-tapering guidance.
Where Camden lands · meets the bar
Camden has one Griffonia / 5-HTP SKU — NB-412 5HTP from Griffonia Seed 90 Capsules. It supplies Griffonia Seed Extract 20:1 at 175 mg per capsule, declared <30% 5-HTP (up to ~52 mg 5-HTP per capsule). Standardisation is declared on the label. The label carries the pregnancy contraindication and the SSRI / antidepressant interaction warning. Camden makes no mood / sleep / appetite claims on the PDP — the framing is on the seed source and the precursor-of-serotonin biochemistry only. Heavy-metal + contaminant screening is on the recommended-documents list for the SKU; CoA is archived per batch.