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
Verifera Evidence ReviewCamden’s own editorial review · evidence-graded, verification in progress — graded, not guessed.

Camden's own editorial team graded each health claim below on the strength of the published evidence — trials weighed with Cochrane RoB 2, systematic reviews with AMSTAR 2, under the CEGA method. 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
  1. What it is
  2. At a glance
  3. What people use it for
  4. How it works
  5. Common myths
  6. Common online questions
  7. The official position
  8. What the guidance says
  9. Camden's evidence review
  10. Safety, interactions & who should avoid it
  11. How to take it
  12. How to spot quality
  13. Sources

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 evidenceLimited

  • Adults 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 provenInsufficient

  • Adults 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 provenInsufficient

  • Adults 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.

⚖️ The official position

What may lawfully be claimed about Griffonia (5-HTP source) in Great Britain. This is a regulatory position, not an evidence grade.

No health claim is authorised for Griffonia (5-HTP source) in Great Britain.

This page describes the evidence and online discussion without making a claim.

UK regulatory landscape

UK regulatory tier: Food supplement

UK regulatory rules evolve. This summary is editorial — businesses should consult regulatory counsel; consumers should consult their pharmacist or GP.

🩺 What the guidance says

What UK and international health bodies say. Guidance leads; Camden’s own evidence review follows below.

  • NHSConditional

    Herbal medicines (NHS)

    The NHS advises that herbal products are not held to the same proven safety and quality standards as licensed medicines unless registered, that they can interact with prescription medicines and may be unsuitable in pregnancy or before surgery, and that people should tell their doctor or pharmacist about any herbal supplement they take. It points to the Traditional Herbal Registration (THR) mark where one applies.

    Read the guidance →

  • EFSANot assessed

    EFSA Article 13 botanical health claims — on hold (griffonia)

    Health claims for griffonia remain on hold or have not been authorised in the Article 13 process. No health claim is permitted for griffonia as a food supplement.

    Read the guidance →

  • GB-NHCNot assessed

    GB Nutrition and Health Claims register — griffonia (no authorised claim)

    The Great Britain Nutrition and Health Claims register holds no authorised health claim for griffonia. No health claim may be made for a griffonia food supplement sold in Great Britain.

    Read the guidance →

🔬 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.

  1. Self-reported low mood — short-term

    Evidencelimited

    Older 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]

  2. Sleep / sleep-onset latency — short-term

    Evidencelimited

    Small 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]

  3. Appetite regulation in obesity / overweight

    Evidencelimited

    Small 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]

  4. Migraine prophylaxis (historical)

    Evidencelimited

    Older 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]

  5. Eosinophilia-myalgia syndrome (EMS) — historical safety signal

    Evidencemixed

    In 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.

  6. Combination with serotonergic medication — interaction risk

    Evidencemixed

    Serotonin 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.

Sources

Numbered references cited above plus general authoritative reading. Citations in the body link to the matching number here.

How to read these sources:

  • Tier 1 (UK authoritative): NHS, NICE, BNF, EFSA, FSA, GB NHC Register, SACN, MHRA.
  • Tier 2 (primary literature): peer-reviewed RCTs cited by PMID.
  • Tier 3 (mechanistic): in-vitro / animal-model literature — interpret with caveat.
  1. NICE NG222 — Depression in adults: treatment and management
  2. NICE CG113 — Generalised anxiety disorder and panic disorder in adults: management
  3. BNF — interactions checker
  4. GB Nutrition and Health Claims Register (gov.uk)
  5. NHS — supplements and complementary medicines overview
  6. NICE CG113
  7. NHS — conditions › insomnia
  8. NICE NG246
  9. NICE CG150

Verifera® is published by Camden Medicals — a UK supplement retailer. We have a commercial interest in some of the ingredients described here; we declare it on every page and our editorial process forbids adjusting copy to favour our own products. Read our editorial policy.

This page is information, not medical advice. Talk to your pharmacist or GP before starting any supplement, especially if you take prescribed medicines, are pregnant or breastfeeding, or have an existing condition.

Suspected side effects can be reported to the MHRA via the Yellow Card scheme: yellowcard.mhra.gov.uk