Best Muscle Stimulators

Updated September 2021
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BestReviews spends thousands of hours researching, analyzing, and testing products to recommend the best picks for most consumers. We only make money if you purchase a product through our links, and all opinions about the products are our own. Read more  
BestReviews spends thousands of hours researching, analyzing, and testing products to recommend the best picks for most consumers. We buy all products with our own funds, and we never accept free products from manufacturers.Read more 
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How we decided

We purchase every product we review with our own funds — we never accept anything from product manufacturers.

30 Models Considered
30 Hours Researched
2 Experts Interviewed
180 Consumers Consulted
Zero products received from manufacturers.

We purchase every product we review with our own funds — we never accept anything from product manufacturers.

Buying guide for best muscle stimulators

Muscle stimulators aren't magic bullets that develop strength and encourage muscle growth, they are medical devices best used for rehabilitation and pain management. There are two types of muscle stimulators – an EMS helps rehabilitate muscles while a TENS unit can block pain. Coincidentally, the features that make each type the best are very similar.

You will want a unit that gives you control over the pulse strength so you can have the greatest comfort and maximum effectiveness. A display screen, multiple channels, and automated therapy programs are all recommended. A button lock that keeps you from changing any of the settings during treatment is highly desirable.

If you read on, you will discover why the FDA regulates muscle stimulators and learn about some of the risks involved in using this type of device. 

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Some people use an electrical muscle stimulation device for stress release. Some people use EMS treatment before a weightlifting session to help warm up their muscles.

How muscle stimulators work

A muscle stimulator is a machine, handheld or larger, with connected electrodes. Larger machines typically exist only in doctor’s offices and therapy clinics. For use at home, handheld devices provide the most common type of muscle stimulation.

Every muscle stimulator includes a series of electrodes that are connected to the unit via thin wires. To use a muscle stimulator, you attach the electrodes to your skin with adhesive pads and power on the machine.

The machine delivers electrical impulses through the electrodes. These pulses attempt to mimic the body’s nervous system, telling the muscles under the electrodes to contract. Once the electrical pulse stops, the muscles relax.

Do muscle stimulators actually work?

The question of whether muscle stimulators actually accomplish what they’re designed to do is debated among scientists. Ultimately, the outcome of muscle stimulator usage depends on what you want to achieve with the machine.

Little to no benefit

Naysayers argue that muscle stimulators don’t actually offer any significant help. They suggest that some people may experience success in one or two of these areas but not in all of them.

Our advice: use your muscle stimulator in a proper manner, as outlined above, for a better chance of success.

Muscle stimulator benefits

Some people who use muscle stimulators report pain relief and a reprieve from muscle and joint soreness after workouts. And some people say their muscles work more efficiently through daily use of muscle stimulators, which tone their muscles.

With a doctor’s prescription, a muscle stimulator could potentially speed the healing of joint injuries. In fact, some doctors use a muscle-stimulating device to prevent atrophy in the muscles of immobilized patients. And doctors who treat stroke victims sometimes use muscle stimulators to promote muscle retraining.

Additionally, doctors sometimes use muscle stimulators to treat patients with muscle spasms. Some doctors believe muscle stimulators work to speed recovery for surgery patients, too.

Muscle growth

Scientists tend to agree on one thing regarding muscle stimulators: they don’t cause muscle growth. Even though the claim of muscle growth remains popular in some EMS advertisements, scientific data refute such claims.

Personal preference

Ultimately, the individual must decide whether this device helps in any way. In other words, using a muscle stimulator is an issue of personal preference. Your doctor may be able to help you determine if an at-home muscle stimulator is right for you.

"Although some people believe muscle stimulators promote muscle growth, no scientific evidence exists to support that claim. These are great for temporary relief, but should not be used as a cure."

Muscle stimulator features

Notable features of at-home muscle stimulator devices include the following.

Automatic therapy programs

Some muscle stimulators come with pre-programmed therapy plans. These therapy programs offer a great way to handle certain treatment situations with minimal effort on your part.

Button lock

A button lock prevents changes to the pulse strength that could result from inadvertent pressing of the buttons. The power button continues to work in case you need an emergency shut-off, though.

LCD screen

Some muscle stimulators include an LCD screen that displays data about the device’s settings. Having feedback available about the device simplifies operation for the user.

Multiple channels

Some muscle stimulators include two channels that deliver two separate levels of pulses. Having the ability to deliver different pulse strengths may enhance your results.

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For your safety
Avoid targeting your biceps and triceps at the same time. These muscle groups should be targeted separately, as they’re considered antagonistic muscles that work against each other.
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Testing muscle stimulators
After spending nearly 11 hours researching over 100 muscle stimulators we purchased our top pick and tested in the BestReviews lab.

Power options

At-home muscle stimulators run from battery power. As such, they’re easy to take anywhere.

Some also provide the ability to connect to a wall outlet. This versatility increases a the product’s overall value.

Pulse strength

Most muscle stimulators allow you to adjust the level of the pulse. After all, you may feel like you need a stronger pulse on some days than other.

Treatment timer

Your muscle stimulator should have a timer that allows you to select the number of minutes you wish to receive treatment. Once the simulator reaches the designated time, it shuts off automatically.

Hands on: muscle stimulators

Why does the FDA regulate muscle stimulators?

Consumers who question the safety of muscle stimulators take comfort in knowing that the FDA regulates these devices. By offering muscle stimulator regulation, the FDA forces manufacturers to prove the safety of their products..

  • The FDA regulates muscle stimulators that doctors and physical therapists use in their offices. This regulation ensures that use of the machines remains safe for physical therapy and rehabilitation.

  • The FDA also ensures that at-home muscle stimulators work safely for consumers. FDA regulation reduces the chance of potential problems, such as burns and shocks, by mandating safer components and proper instructions.

The FDA also regulates the claims that manufacturers can make when advertising muscle stimulators in the U.S. Sellers can legally discuss pain relief, muscle toning/firming, and physical therapy benefits of these machines. However, they cannot legally claim weight loss benefits or muscle gain when advertising their products.

Notably, some EMS devices available for sale don’t meet FDA regulations. These devices pose safety hazards, as described in the next section.

We encourage potential buyers to buy only FDA-approved muscle stimulators from reputable retailers and manufacturers.

"When using a tens unit, mix up the setting every time you use it. This will keep your body guessing. Your body can become accustomed to the electric stimulation if kept on the same settings, rendering it ineffective. "

Dangers of muscle stimulators

As mentioned above, ensuring the safety of the construction of muscle stimulators falls under FDA regulation. Choosing to use a device that fails to meet FDA regulations could lead to numerous problems and dangers.

If applied or operated improperly, even an FDA-approved device could cause skin irritation, burns, or pain. Some people suffer adverse reactions to the adhesive used on the electrode pads, too.

Beyond the omission of FDA regulation, here are some other red flags to watch out for.

Inferior cables

All included cables and electrodes must follow electrical safety standards. Poor-quality cables could cause inadvertent shocks.

Corrosion in the battery compartment

People who wear these devices for extended periods of time potentially introduce moisture (through sweat) into the battery compartment. This causes corrosion and potential failure of the device.

Interference with other devices

Occasionally, a non-regulated muscle stimulator causes interference with medical devices, such as pacemakers. This is not a safe situation.

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Wearing a muscle stimulator for an extended period can lead to corrosion if sweat seeps into the battery compartment.

Tips for success

To make the most of your muscle stimulator, you must set up the device properly. Follow these tips.

Read the directions

Applying the electrodes in the right locations and using the proper settings will give you better results. Make sure you read and understand the machine’s instructions before using it.

Limit the number of muscles you target

Don’t try to use a wide range of electrodes to target multiple muscle groups. Keep the location of muscle stimulator electrodes simple. Target one muscle group at a time.

Only stimulate one arm at a time

To receive the strongest electrode signals, focus on only one arm or leg at a time.

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Did you know?
A TENS unit targets and stimulates nerves; it differs from an EMS unit, which targets muscles. Some devices combine TENS and EMS capabilities.

Muscle stimulator prices

How much should you expect to pay for an at-home muscle stimulator?

$30 or less

Low-end muscle stimulators generally carry a price tag of $30 or less. These devices offer fewer settings and lower overall power pulses than more expensive units.

$70 to $100

An at-home machine with a price point around $70 to $100 may offer both TENS and EMS capabilities.

Over $100

The large machines found in medical offices cost a lot more than at-home machines. They offer plenty of power to perform the therapy the doctor prescribes.

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The US FDA regulates and must approve any muscle stimulators available for sale in the U.S. Any muscle stimulator you consider purchasing should meet FDA guidelines. If a manufacturer makes claims that seem too good to be true, avoid buying their product.

Muscle stimulator FAQ

Q. Which companies create the best muscle stimulators on the market?
Some of the best brand names in muscle stimulators include AccuRelief, ChoiceMed, Compex, iReliev, Pure Enrichment, Santamedical, and United Surgical. When choosing a device, we recommend that you stick to a well-known brand.

Q. Why don’t muscle stimulators create muscle growth?
Muscle growth occurs through the tearing of muscle fibers. When the body repairs those muscles, they grow. A muscle stimulator alone doesn’t break down the muscle fibers as does weightlifting. Additionally, no range of motion exists when using a muscle stimulator. The range of movement involved in lifting weights aids muscle growth.

Q. How does a muscle stimulator reduce pain?
Several theories exist as to why and how these devices reduce pain for some people. For those with sore muscles, the act of contracting and relaxing the muscles repeatedly loosens muscle tissue. Another theory says the electrical pulses block nerves from sending pain signals to the brain. Perhaps the muscle stimulation causes the brain to release endorphins as it does during exercise. In this theory, the brain reads the muscle contractions and relaxations as exercise.

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