4ms Spectral Multiband Resonator (SMR)

Marsoni

M251S

$195.00

Get it in 3 business days with 1 day shipping. Friday, May 29

4ms Spectral Multiband Resonator (SMR)Fully tested, perfect working condition. Minimal rack rash. About Used Items: All modules include a power ribbon cable and M3 screws. Please be aware that although all used items have been tested to work as they are designed, they are sold "As Is" and are not accepted for returns unless there is a defect in the used item. Used items DO NOT qualify for Free Shipping, if you order a new item with a used item you will be charged shipping based on the

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Your 4ms Spectral Multiband Resonator (SMR) orders ship within 1-2 business days.

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Standard: 3-7 business days
Fast: 2-3 business days
Express: 1-2 business days

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Exchange/Return Notes

We offer a 30-day return/exchange service after receiving.
Final sale items are not eligible for returns or exchanges.
To process your return/exchange, please contact us at [email protected]
Please click here for more details>>> Return & Exchange Policy

I like these time released tablets. Time release is surprisingly hard to find unlike the immediate release style tablets. Time release allows for a longer sleep pattern as it enters the blood stream slowly over time allowing it to stay in you system. Immediate release will hit you hard and fast but your body will metabolize within a couple of hrs leaving you without the melatonin in you system. I took off a star for being pricey, but these do work very well.

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Reviewed in the United States on October 17, 2025

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Sharon D79

Lowell, US

★★★★★ 5

Effective,low dose melatonin

Purchased this product again.

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Reviewed in the United States on May 7, 2026

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Bill

Charlottesville, US

★★★★★ 3

Three Stars

Will help you sleep.

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Reviewed in the United States on October 8, 2016

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Carley Rousse

San Leandro, US

★★★★★ 5

Good

The only melatonin that works for me

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Reviewed in the United States on April 2, 2026

Verified Purchase

N. Hannah

Waukegan, US

★★★★★ 5

Source Naturals Melatonin is the best!

My husband and I have been using Source Naturals Melatonin for almost 25 years. I have tried a few other brands, and I definitely think Source Naturals is the best! I once saw a program on Discovery channel about how Melatonin is an important heart antioxidant, and that after age 40 the Melatonin in our system goes way down. We had also just moved to a high altitude town, and I was having great difficulty sleeping because of the high altitude. We started taking Source Naturals Melatonin, and I was able to sleep like a baby. I really recommend the time release especially, and we also take a 1 mg sublingual lozenge to fall asleep more quickly.

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Reviewed in the United States on August 27, 2017