Can you take BDNF as a supplement?

No. BDNF cannot cross the blood-brain barrier effectively, so oral or injected BDNF would not reach the brain. Instead, focus on evidence-based methods to increase natural BDNF production, especially aerobic exercise.

How can I increase my BDNF levels?

Aerobic exercise is the most robust method. Other approaches include adequate sleep, social interaction, sunlight exposure, healthy diet (especially omega-3s), and stress reduction. Some medications including certain antidepressants also increase BDNF.

What happens if BDNF is low?

Low BDNF levels are associated with depression, cognitive impairment, reduced neuroplasticity, and increased vulnerability to neurodegenerative diseases. However, BDNF is one factor among many in these complex conditions.

Fact-checked by the Peptide Authority Editorial Board · Last reviewed: 1 February 2026

Share:X Post LinkedIn

Cognitive & Neurological•Updated 2026-02-01•5 min read

What Is BDNF? Benefits, Research & Safety

A critical growth factor for brain health, neuroplasticity, and neuronal survival, with implications for depression, memory, and neurodegenerative diseases.

Share:X Post LinkedIn

Also known as:

Brain-Derived Neurotrophic Factor

Abrineurin

AStrong human evidenceUK: Sold as 'research only' (UK)WADA: Sport status unclear

UK summary: Endogenous neurotrophin essential for brain plasticity. Not a medicine; the molecule is too large and unstable to be useful as a therapeutic. This entry is educational background.

Quick Facts

Overview

Brain-Derived Neurotrophic Factor (BDNF) is a member of the neurotrophin family of growth factors, playing essential roles in the development, maintenance, and function of neurons in the central and peripheral nervous systems. It is crucial for learning, memory, and higher cognitive functions. BDNF supports the survival of existing neurons, encourages the growth and differentiation of new neurons (neurogenesis), and promotes synaptic plasticity—the ability of synapses to strengthen or weaken over time, which is fundamental to learning and memory. Low levels of BDNF have been consistently associated with various neurological and psychiatric conditions including major depression, Alzheimer's disease, schizophrenia, and Huntington's disease. This has made BDNF signaling a major target for therapeutic research. Unlike many peptides in this database, BDNF itself is not typically administered exogenously due to its inability to cross the blood-brain barrier effectively. Instead, research focuses on interventions that increase endogenous BDNF production (such as exercise, diet, and certain medications) or on developing small molecules that mimic BDNF's effects. BDNF is primarily a research and biomarker interest rather than a directly administered therapeutic peptide, though understanding its biology has major implications for treating neurological and psychiatric disease.

Evidence standards summary

BDNF — evidence and risk at a glance

Twenty standard modules scored against the Peptide Authority evidence grading methodology. Missing modules indicate the field has not yet been characterised editorially — treat absences as uncertainty rather than reassurance.

01Evidence snapshot

AStrong human evidenceOverall grade against our evidence grading methodology.

Endogenous neurotrophin essential for brain plasticity. Not a medicine; the molecule is too large and unstable to be useful as a therapeutic. This entry is educational background.

02Human evidence grade

AStrong human evidenceStrength of evidence from published human trials.

03Preclinical evidence grade

AStrong human evidenceAnimal-model and in-vitro evidence quality.

04Regulatory status

UK: BDNF is not a therapeutic agent but a research biomarker and target.
EU: Same—research focus rather than approved medication.
Notes: BDNF itself is not administered therapeutically. Research focuses on enhancing endogenous BDNF through lifestyle interventions or developing small molecules that mimic its effects. BDNF levels are increasingly used as biomarkers in research and clinical settings.

05Approved medical uses

None in the UK or EU as a finished medicine. (Or: not yet documented; treat as absence rather than approval.)

06Unapproved / promotional claims

BDNF supplements raise brain BDNF.
BDNF peptide injections treat depression and Alzheimer's.
Direct BDNF administration enhances learning and memory.

07Common internet claims

Marketed as a supplement to boost BDNF for depression / cognition.
Sold by some online retailers as a research-only injection.
Promoted in nootropic stacks as a brain-derived growth factor.

08Claim vs evidence

Claim	Evidence	Human evidence?	Regulatory concern	Safer wording
“BDNF supplements raise your brain BDNF levels”	E	No	High	BDNF cannot cross the blood-brain barrier; oral BDNF supplements have no rational mechanism. Exercise, sleep, and certain medications do affect BDNF levels indirectly.

09Safety uncertainty score

High

Limited human safety data; meaningful uncertainty about rare or long-term effects.

10Known adverse signals

Native BDNF is too large and unstable to cross the blood-brain barrier; exogenous routes are pharmacologically problematic.
Injectable claims are not backed by any clinical trial or safety data.
Theoretical risk of disrupting endogenous neurotrophin signalling.

11Drug-interaction uncertainty

High

Interaction picture sparse; meaningful uncertainty when combined with other medicines.

12Anti-doping status

WADA: Sport status unclearWADA strict-liability framing applies.

13UK legal position

UK: Sold as 'research only' (UK)

BDNF is not a therapeutic agent but a research biomarker and target.

14EU legal position

Same—research focus rather than approved medication.

15What this page cannot tell you

Whether any 'BDNF supplement' actually raises BDNF in your brain (mechanistically implausible).
Whether any injectable BDNF product contains BDNF protein at any concentration.
Long-term effects of exogenous BDNF signalling on neural circuits.

16Last reviewed

Last reviewed: 1 February 2026

Next review due: 1 February 2027

Spotted an error or something out of date? Send a correction.

17Citation quality score

AStrong human evidenceQuality of the sources we cite, graded against the evidence grading methodology.

18Research gaps

Delivery problem (blood-brain barrier) prevents BDNF being developed as a therapeutic itself.
TrkB-receptor small-molecule agonists are under investigation as a more practical route.

19Safer alternatives / established care pathways

Regular aerobic exercise — the strongest evidence-based intervention that raises endogenous BDNF.
Adequate sleep, social engagement, learning new skills — all support BDNF expression.
Licensed antidepressants for depression (they upregulate BDNF as part of their mechanism).
Memory clinic referral if cognitive decline is the concern.

20Doctor discussion prompts

Questions to ask a qualified clinician

These are starter questions you can adapt for a GP, specialist, pharmacist, or anti-doping advisor. The aim is to help you have a better-informed conversation — not to replace one.

What evidence-based interventions affect BDNF (exercise, sleep, licensed medicines)?

Discovery & History

BDNF was discovered in 1982 by Yves-Alain Barde and Hans Thoenen at the Max Planck Institute in Germany. It was the second member of the neurotrophin family to be identified, following Nerve Growth Factor (NGF) discovered by Rita Levi-Montalcini. Initial research focused on BDNF's role in neuronal development and survival. Studies demonstrated that BDNF was essential for the development and maintenance of multiple neuronal populations, including those in the hippocampus critical for memory. The discovery that BDNF supports synaptic plasticity and long-term potentiation (LTP)—the cellular basis of learning and memory—expanded interest significantly. The phrase "neurons that fire together, wire together" relates to BDNF-dependent synaptic strengthening. Research in the 1990s and 2000s revealed associations between BDNF levels and depression. The "neurotrophin hypothesis of depression" proposed that stress reduces BDNF, contributing to neuronal atrophy, while antidepressants work partly by restoring BDNF levels. Genetic studies identified a common BDNF polymorphism (Val66Met) affecting BDNF secretion and associated with cognitive differences and psychiatric vulnerability. This has become one of the most studied genetic variants in neuroscience. Current research pursues BDNF-mimetic drugs that can cross the blood-brain barrier, as well as lifestyle interventions known to boost endogenous BDNF.

Mechanism of Action

BDNF exerts its effects primarily through the TrkB receptor: **TrkB Receptor Activation** BDNF binds to the TrkB receptor (tropomyosin receptor kinase B): - Triggers receptor dimerization and autophosphorylation - Activates multiple intracellular signaling cascades - Effects include cell survival, growth, and plasticity - Pro-BDNF can activate p75NTR with different effects **Downstream Signaling Pathways** TrkB activation initiates several key pathways: - MAPK/ERK: Neuronal differentiation and survival - PI3K/Akt: Cell survival and growth - PLCγ: Synaptic plasticity and neurotransmission - These pathways converge on transcription factors including CREB **Synaptic Plasticity** BDNF is essential for multiple forms of plasticity: - Long-term potentiation (LTP) in hippocampus - Spine growth and synapse formation - AMPA receptor trafficking - Structural remodeling of dendrites **Activity-Dependent Expression** BDNF expression is regulated by neural activity: - Neuronal activity increases BDNF transcription - This creates a positive feedback loop - Exercise and learning increase BDNF - Stress and inactivity decrease BDNF

Researched Benefits

Based on preclinical and clinical research findings:

1
Essential for learning and memory formation
2
Supports neuronal survival and neurogenesis
3
Promotes synaptic plasticity
4
Potential target for depression treatment
5
May protect against neurodegenerative diseases
6
Mediates beneficial effects of exercise on the brain
7
Biomarker for neurological and psychiatric conditions

Claim vs Evidence

How popular claims about BDNF stack up against the current research, graded using our public evidence grading methodology.

Claim	Evidence	Human evidence?	Regulatory concern	Safer wording
“BDNF supplements raise your brain BDNF levels”	E	No	High	BDNF cannot cross the blood-brain barrier; oral BDNF supplements have no rational mechanism. Exercise, sleep, and certain medications do affect BDNF levels indirectly.

Theoretical Dosing & Protocols

⚠️ Educational Only: The following information is derived from research literature and is not a prescription or recommendation. No standardised human dosing exists. Always consult a qualified healthcare professional.

Theoretical Dosage	Not applicable for direct administration
Frequency	N/A
Duration	N/A
Notes	BDNF does not cross the blood-brain barrier effectively, limiting direct administration. Research focuses on increasing endogenous BDNF through exercise, diet, certain medications, and developing BDNF-mimetic compounds.

Administration Routes

Routes studied in research settings (educational only):

Direct administration not practical (does not cross blood-brain barrier)
Research focuses on indirect enhancement strategies
Intrathecal/intracerebroventricular routes used only in animal research

Half-Life	Stability
Short in circulation; locally produced and acts in paracrine/autocrine fashion	Requires careful handling in research settings

Safety Profile & Known Risks

Commonly Reported Side Effects

Not directly administered therapeutically

Rare Risks & Concerns

Excessive BDNF has been linked to epilepsy in animal models
Chronic pain sensitization (peripheral BDNF)
Theoretical concerns about promoting tumour growth

Contraindications

Direct BDNF administration is not a current therapeutic approach

UK & EU Regulatory Context

🇬🇧 United Kingdom

BDNF is not a therapeutic agent but a research biomarker and target.

🇪🇺 European Union

Same—research focus rather than approved medication.

BDNF itself is not administered therapeutically. Research focuses on enhancing endogenous BDNF through lifestyle interventions or developing small molecules that mimic its effects. BDNF levels are increasingly used as biomarkers in research and clinical settings.

Clinical Studies Summary

Blood levels of brain-derived neurotrophic factor (BDNF) in psoriasis: a systematic review and meta-analysis.

This study found a significant reduction in BDNF levels in psoriasis patients, suggesting a potential link between BDNF dysregulation and the pathophysiology of psoriasis. Understanding the role of BDNF in these conditions may inform future research and therapeutic strategies for patients suffering from both.

Adv Rheumatol. 2026View on PubMed

Association Between Irisin Level and Cognitive Function: A Systematic Review and Meta-Analysis.

This study implied that irisin has a positive effect on cognitive function, and the mechanism may be associated with promoting the expression of BDNF.

Brain Behav. 2025View on PubMed

Peripheral neurotrophin levels during controlled crack/cocaine abstinence: a systematic review and meta-analysis.

Further improved methods are suggested, and a potential BDNF augmentation hypothesis is proposed that, if true, would help to understand initial abstinence as a re-adaptation period influenced by neurotrophins such as the BDNF.

Sci Rep. 2024View on PubMed

Brain-derived neurotrophic factor levels across psychiatric disorders: A systemic review and network meta-analysis.

08]). In conclusion, abnormal BDNF levels have been found in psychiatric disorders, and the changes in peripheral BDNF levels in patients with psychiatric disorders were reconfirmed in this study, which suggests BDNF exhibits promising clinical utility and may hold diagnostic value in distinguishing between MDD and BD.

Prog Neuropsychopharmacol Biol Psychiatry. 2024View on PubMed

Effect of cannabis use on blood levels of brain-derived neurotrophic factor (BDNF) and nerve growth factor (NGF): A systematic review and meta-analysis.

This systematic review highlights the need for further research to elucidate the relationship between cannabis use and these neurotrophic factors. A better understanding of these associations can contribute to our knowledge of the neurobiological effects of cannabis and inform potential implications for mental health, cognitive function, and neurodegenerative disorders.

Brain Behav. 2024View on PubMed

Brain-derived neurotrophic factor (BDNF) levels in panic disorder: A systematic review and meta-analysis.

This systematic review and meta-analysis provide evidence of lower BDNF protein levels in individuals diagnosed with panic disorder compared to healthy controls. The findings suggest a potential role for BDNF dysregulation in the pathophysiology of panic disorder. Further research is warranted to elucidate the underlying mechanisms and potential therapeutic implications.

Brain Behav. 2024View on PubMed

Registered Trials & Regulatory Status

Registered trials

Currently recruiting

Furthest phase

Phase 2

Approved product

15 of 16 completed trials have never posted results. Unreported trials are not neutral: results that go unpublished are more often negative ones.

The Role of Urinary RhoA, NGF, and BDNF Levels in Overactive Bladder and Vitamin D Deficiency

Status: Not Yet Recruiting · 52 participants · Tarik Emre Sener

Conditions: Overactive Bladder, Vitamin D Deficiency

No results postedNCT07513363

Study on the Mechanism of Pei Tu Ning Feng Tang in Alleviating Tourette Syndrome Via Functional Near-Infrared Spectroscopy (fNIRS) and the DA-MAPK-BDNF Pathway

Status: Not Yet Recruiting · 60 participants · Dongdong Qin

Conditions: Tourette Syndrome in Children

No results postedNCT07417371

Investigating the Evolutionary Impact of Metabolic Flexibility on Physical Activity-Dependent BDNF and Cognition: Insights From the Val66Met Polymorphism

PHASE1

Status: Not Yet Recruiting · 50 participants · University of Southern California

Conditions: Cognition, BDNF

No results postedNCT07218497

Effects of Different Types of Exercise on BDNF and Cognitive Performance (Exercise-BDNF)

Status: Completed · 12 participants · Aksaray University Training and Research Hospital

Conditions: Exercise Training, BDNF, Cognitive Functions

No results postedNCT07137611

Effect of Isometric Neck Exercises on Cervicogenic Headache Symptoms, Cortisol and BDNF Levels Among Smart Phone Users

Status: Completed · 44 participants · Khyber Medical University Peshawar

Conditions: Cervicogenic Headache, Sleep Disturbance, Stress

No results postedNCT07354776

Preoperative Study of the Correlation Between BDNF-TrkB Signaling Pathway Expression Levels in Cerebrospinal Fluid and Blood and Postpartum Depression

N/A

Status: Completed · 200 participants · The First People's Hospital of Lianyungang

Conditions: Postpartum Depression (PPD)

No results postedNCT06947278

Curcumin and EGCG Supplementation to Improve Serum BDNF and Mood Disturbance

EARLY_PHASE1

Status: Recruiting · 64 participants · Auburn University

Conditions: Mood Disturbance

No results postedNCT06531863

THE EFFECTS OF GAMBIR CATECHIN (UNCARIA GAMBIR ROXB) SUPPLEMENTATION ON COGNITIVE FUNCTION, EXPRESSION OF APP, MAPT, BDNF, IL-10, TGF-Β GENES, AND PLASMA MDA LEVELS IN THE ELDERLY.

Status: Completed · 64 participants · Rahmi Novita Yusuf

Conditions: Elderly Individuals Aged 60 Years or Older, Mild Cognitive Impairment (MCI)

No results postedNCT06604390

Effects of Sleep Restriction on Female Soccer Players: Physical Performance, Muscle Damage, Inflammation, and BDNF Levels.

Status: Unknown · 20 participants · University School of Physical Education, Krakow, Poland

Conditions: Sleep, Sleep Restriction

No results postedNCT06251362

3h of PNE on BDNF and Pain Levels

Status: Unknown · 66 participants · Universidad Autonoma de Madrid

Conditions: Chronic Pain, Musculoskeletal Pain

No results postedNCT05736172

The Effect of Theta-burst Stimulation on Serum BDNF

Status: Unknown · 60 participants · Taipei City Hospital

Conditions: Gambling Disorder

No results postedNCT05854706

Effect of Frontal Transcranial Direct Current Stimulation on BDNF in Stroke Patients With Cognitive Impairment

Status: Unknown · 40 participants · The Second Affiliated Hospital of Dalian Medical University

Conditions: Stroke

No results postedNCT06386614

Adverse event reports (FDA FAERS)

Not applicable: no licensed product contains this peptide, so it is not reported through FAERS. This is an absence of surveillance, not evidence of safety.

Source: ClinicalTrials.gov and openFDA. Updated automatically.

Looking for BDNF?

Source research-grade BDNF from a trusted UK supplier — third-party tested with certificate of analysis.

View at Supplier

Frequently Asked Questions

Questions to ask a qualified clinician about BDNF

These are starter questions you can adapt for a GP, specialist, pharmacist, or anti-doping advisor. The aim is to help you have a better-informed conversation — not to replace one.

What evidence-based interventions affect BDNF (exercise, sleep, licensed medicines)?

Related Peptides

Selank

A synthetic peptide based on tuftsin, developed in Russia for anxiolytic and nootropic properties, approved there for anxiety and neurasthenia.

Learn more

Semax

A synthetic peptide based on ACTH, developed in Russia as a nootropic and neuroprotectant, approved there for cognitive disorders and stroke.

Learn more

Explore More Peptides

Browse our comprehensive database of research-backed peptide profiles.