Peripheral nerves can repair themselves, but the process is slow and often incomplete. Damaged nerve fibers regrow at roughly 1 millimeter per day, or about one inch per month, which means recovery from a significant injury can take months to years depending on how far the nerve needs to regrow. The good news is that several approaches, from surgery to nutrition to physical therapy, can meaningfully speed up or improve that process.
How Nerves Actually Heal
Understanding what happens inside a damaged nerve helps explain why certain treatments work and why patience matters. Nerve repair unfolds in two main phases: a cleanup phase and a rebuilding phase.
In the cleanup phase, immune cells rush to the injury site and release chemical signals that recruit more immune cells. At the same time, Schwann cells, the support cells that wrap around nerve fibers and form their protective insulation, detach from the damaged sections. These Schwann cells team up with immune cells to clear away debris from the broken nerve fibers and their deteriorating insulation. This debris removal is a critical bottleneck. The faster it happens, the sooner rebuilding can begin.
In the rebuilding phase, those same Schwann cells transform into a repair-oriented state. They release growth-promoting chemicals, build a scaffolding structure, and essentially lay down a track for the regrowing nerve fiber to follow. They also supply the regrowing nerve with energy in the form of lactate and iron. Without healthy Schwann cells, nerve regrowth stalls. This is one reason central nervous system injuries (brain and spinal cord) heal so poorly: the central nervous system lacks the same type of repair-ready support cells.
When Surgery Is Needed
Not all nerve damage requires surgery. Mild compression injuries, like carpal tunnel syndrome caught early, often improve once the pressure is relieved. But when a nerve is severed or has a gap that the regrowing fibers can’t bridge on their own, surgical repair becomes necessary.
The gold standard is a nerve graft, where a surgeon takes a less important sensory nerve from somewhere else in your body and uses it to bridge the gap. This approach works well for gaps up to about 5 centimeters. For smaller gaps in minor sensory nerves, synthetic tubes called nerve conduits can guide regrowth across the gap. One study using collagen conduits for digital nerve injuries reported good or excellent sensation recovery in 89% of patients. However, conduits are currently best suited for small nerves with short gaps. For larger or longer injuries, a nerve graft remains the more reliable option.
Timing matters. The sooner a severed nerve is repaired, the better the outcome, because the Schwann cells and muscle fibers downstream from the injury gradually lose their ability to support regrowth the longer they wait without nerve signals.
Electrical Stimulation
Low-frequency electrical stimulation is one of the more promising non-surgical tools for nerve repair. In animal studies, brief electrical stimulation at 20 Hz applied at the time of nerve repair significantly increased the number of regrowing nerve fibers, the thickness of their insulation, and the number of motor and sensory nerve cells that successfully reconnected, even when treatment of the injury had been delayed by weeks.
The key detail is that the stimulation must be low-frequency. High-frequency electrical stimulation can actually worsen nerve damage. Transcutaneous electrical nerve stimulation (TENS), a common pain-relief tool, uses surface electrodes to deliver these currents. Low-frequency TENS is generally defined as 10 Hz or less. While TENS is widely available and used for nerve-related pain, the specific parameters that best promote nerve regrowth in humans still need more standardization.
Nutritional Support for Nerve Healing
Vitamin B12
Vitamin B12 plays a direct role in maintaining and rebuilding the myelin sheath, the insulating layer around nerve fibers that allows signals to travel quickly. It also promotes nerve regeneration and can reduce abnormal nerve firing that causes pain. Deficiency in B12 alone can cause neuropathy, so correcting a deficiency is often the first step.
Studies on B12 for nerve pain have used a wide range of doses, from as little as 3 micrograms daily in combination supplements up to 1,000 micrograms by injection. Methylcobalamin, the active form of B12, is the most commonly studied version. A typical therapeutic dose in clinical studies is 500 to 1,500 micrograms of methylcobalamin daily, either orally or by injection. If you suspect a B12 deficiency, a simple blood test can confirm it.
Alpha-Lipoic Acid
Alpha-lipoic acid is a potent antioxidant that has been studied extensively for diabetic neuropathy. A meta-analysis of randomized controlled trials found that 600 mg per day produced an average 50% reduction in neuropathy symptom scores, including pain, burning, and numbness. The strongest evidence supports intravenous administration at 600 mg daily for three weeks, which earned the highest grade of recommendation for reducing neuropathic pain.
Oral alpha-lipoic acid at the same dose also showed statistically significant improvements over three to five weeks, though the clinical meaningfulness of oral dosing is less certain. Importantly, doses higher than 600 mg per day did not produce better results and caused more side effects like nausea, vomiting, and dizziness. So more is not better here.
Physical Rehabilitation and Nerve Gliding
When nerve damage involves compression or entrapment, such as a nerve getting pinched by surrounding muscles, joints, or scar tissue, physical therapy techniques called neuromobilization can help. These involve specific movements designed to gently slide the nerve through its surrounding tissues or apply controlled tension to restore normal nerve mobility.
Nerve sliding techniques move the nerve relative to the tissues around it, reducing adhesions and improving blood flow to the nerve. Nerve tension techniques apply gentle stretch along the nerve’s path. Both have been shown to improve flexibility of the peripheral nervous system and the surrounding musculoskeletal structures. A physical therapist can teach you specific nerve gliding exercises tailored to the location of your injury, whether it’s the median nerve in the wrist, the ulnar nerve at the elbow, or the sciatic nerve in the leg.
These exercises work best for compression and entrapment injuries rather than severed nerves. They’re low-risk and can be done at home once you’ve been shown the correct form.
Hyperbaric Oxygen Therapy
Hyperbaric oxygen therapy (HBOT), which involves breathing pure oxygen in a pressurized chamber, has shown encouraging results for nerve repair in animal studies. In a rat model of nerve graft repair, HBOT sessions of one hour daily, five days per week at twice normal atmospheric pressure produced several measurable benefits. By day 35, the treated group showed greater numbers of nerve fibers and significantly more remyelination: 1.65 times more in the middle of the graft and 3.3 times more at the far end compared to untreated animals.
By day 90, the percentage of motor nerve fibers in the treated group approached levels seen in completely uninjured nerves. The likely mechanism is that increased oxygen delivery helps immune cells clear debris faster, supports Schwann cell survival and activity, and promotes the growth of new blood vessels to feed the healing nerve. HBOT is available at specialized centers, though access and insurance coverage vary widely. Human clinical trials specific to peripheral nerve injury are still limited.
Stem Cell Therapy
Stem cell approaches to nerve repair are in early clinical testing. Mayo Clinic is currently running trials using a patient’s own stem cells harvested from fat tissue for spinal cord injuries and ALS. A separate study is developing stem cells from skin cells of patients with hereditary peripheral neuropathy to better understand the disease and explore treatments. These trials are focused on safety and feasibility rather than being widely available therapies. Stem cell treatment for nerve damage is not yet a standard option, but it represents an active area of clinical investigation.
What Recovery Actually Looks Like
Because nerves regrow at about one inch per month, you can roughly estimate your recovery timeline by measuring the distance from the injury site to the muscle or skin area the nerve supplies. A wrist injury affecting finger sensation might take two to three months to show improvement. A shoulder-level injury affecting the hand could take a year or more.
Recovery is rarely all-or-nothing. Sensation typically returns before full motor strength. Early signs of recovery include tingling or “pins and needles” sensations progressing along the path of the nerve, which doctors can track by tapping along the nerve to find where the advancing front of regrowth has reached. Nerve conduction studies and electromyography (EMG) can confirm whether a nerve is successfully reconnecting to muscles. Signs of reinnervation on EMG include characteristic changes in the electrical patterns of muscle activity as new nerve connections form and mature.
The quality of recovery depends on several factors: the severity of the original injury, how quickly it was treated, your age (younger people regenerate faster), and whether the underlying cause, such as diabetes or ongoing compression, has been addressed. Combining approaches, for example surgery plus electrical stimulation plus nutritional optimization plus rehabilitation, tends to produce better outcomes than any single treatment alone.