spec sheet10 rows
Neurotrophin-3 (NT-3) is a naturally occurring protein belonging to the neurotrophin family, which also includes nerve growth factor (NGF) and brain-derived neurotrophic factor (BDNF). It supports the survival, growth, and differentiation of developing neurons and helps maintain certain nerve cells in the mature nervous system. Because of these roles, recombinant NT-3 has been investigated as a therapy for nerve and gastrointestinal disorders, although it is not an approved or consumer product.
- Supports neuron survival and growth
- Promotes peripheral nerve maintenance
- Studied for neuropathy and nerve repair
- Supports neuromuscular junctions
- Injection-site reactions in trials
Overview
Neurotrophin-3 was the third member of the neurotrophin family to be identified, after NGF and BDNF, and in humans it is encoded by the NTF3 gene [1]. Like the other neurotrophins it acts as a secreted growth factor that promotes the survival and differentiation of neurons and encourages the formation of new neurons and synapses [1]. During development its expression is especially high in immature regions of the central nervous system where nerve cells are proliferating and migrating, and it declines as those regions mature, a pattern that differs from BDNF [1]. NT-3 is important for particular populations of sensory neurons, including the proprioceptive neurons that sense body position [1].
Because NT-3 promotes nerve growth and repair, recombinant human NT-3 has been tested as a treatment in several conditions. In Charcot-Marie-Tooth disease type 1A, an inherited peripheral neuropathy, a small placebo-controlled pilot trial found that subcutaneous NT-3 improved nerve-fiber regeneration in nerve biopsies and modestly improved neurological measures, alongside supportive results in animal models [3]. NT-3 has also been studied outside the classic nervous-system indications; in a Phase II trial it increased stool frequency and improved colon transit in patients with chronic functional constipation, reflecting its influence on the nerves of the gut [4]. These trials were generally small, and NT-3 has not progressed to approval.
Neurotrophin-3 is a biological protein produced through recombinant technology for research and clinical study, not an oral supplement; as a large protein it would not survive digestion and must be given by injection. There is no validated consumer use, and any material offered outside formal research settings is of unknown quality. Its therapeutic development has been constrained by the practical difficulty of delivering neurotrophins to the right cells and by their short duration in the body.
Mechanism
Neurotrophin-3 works by binding cell-surface receptors on responsive neurons. Its primary target is the receptor tyrosine kinase TrkC, which it activates with high affinity, and it can also bind and signal through the related receptor , giving it an unusually broad range of neurons it can influence [2]. Like the other neurotrophins, NT-3 additionally engages the shared low-affinity p75 receptor [2]. Activation of Trk receptors triggers intracellular signaling cascades that promote neuronal survival, drive differentiation, and stimulate the growth of axons and dendrites [1][2]. In the peripheral nervous system these actions support sensory neurons and Schwann cell function, which is the basis for testing NT-3 in nerve regeneration, while its effects on enteric nerves underlie its influence on gut motility [3][4].
receptor fingerprint
TrkC receptoragonist
Sensory and peripheral neuronssupports
Neuromuscular junctionsupports
TrkA/ receptorsweak agonist
Dosingtypical ranges, not medical advice
interested in protocols and clinical dosages? make an account to see them! ^_^
Safetyrisks and cautions, not medical advice
As an experimental biologic, its safety profile in humans is limited to clinical trial settings. Trials of neurotrophins have sometimes shown injection-site effects and dose-limiting sensory side effects. Self-administration of gray-market NT-3 is not advisable given unknown purity and delivery challenges.
Resources
This entry is here for reference.
Research
- 1990first citedNT-3, BDNF, and NGF in the developing rat nervous system: parallel as well as reciprocal patter…
- 2005most recentNT-3 promotes nerve regeneration and sensory improvement in CMT1A mouse models and in patients
- 1.NT-3, BDNF, and NGF in the developing rat nervous system: parallel as well as reciprocal patterns of expression
- 2.trkC, a new member of the trk family of tyrosine protein kinases, is a receptor for neurotrophin-3
- 3.NT-3 promotes nerve regeneration and sensory improvement in CMT1A mouse models and in patients
- 4.Neurotrophin-3 improves functional constipation
4 listed here; entry last updated August 2026
Reviews
My notesprivate to this device
FAQ
Can I take NT-3 as a pill?
No. It's a large protein that wouldn't survive digestion, so oral use would not work.
What does NT-3 do?
It's a neurotrophin that helps neurons, especially sensory and peripheral ones, survive, grow, and maintain connections.
Is it approved for anything?
It remains a research and clinical-investigation molecule, not an approved supplement or standard therapy.
How is it different from BDNF or NGF?
They're related neurotrophins with different preferred receptors; NT-3 mainly signals through TrkC.
Should I buy gray-market NT-3?
No; purity, delivery, and safety are all unresolved outside controlled research.
Limitations of the evidence
- No validated consumer use
- Delivery is a major obstacle
Adverse effects
- Injection-site reactions in trials
Notes and cautions
- Gray-market purity unknown
- No study administering neurotrophin-3 by the nasal route was found. The neighbouring literature makes this easy to get wrong; intranasal nerve growth factor and intranasal brain derived neurotrophic factor are separate and much better published, and NGF, BDNF, NT-3 and NT-4 are different proteins. Every published record pairing NT-3 with a nasal term either measures NT-3 as an outcome after something else was delivered intranasally, such as stem cells, thyroid hormone or a small molecule TrkC ligand, or studies NT-3 in nasal and olfactory tissue as a biomarker. There is no nasal dose, no nasal bioavailability figure and no nasal safety data for NT-3.