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how fast does a b12 injection start working B12 Injections: Who Should Get Them and How Long Do They Last?

Marsoni M251S
Sale price$27.49
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4.2 ★★★★★
Based on 1535 reviews
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T
Verified Purchase
TN
Louisville, US
★★★★★ 5
Works fine 3 months in
Installed a few months ago, before the winter. I was chasing a no-start after replacing the old battery. We've seen single digit temps in the meantime and it is working well. The fit is perfect in a 2010 focus. If you can slide it in from the side and not drop it in from the top, you can replace it without taking off the intake manifold. There are useful videos online showing this. Good luck!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 28, 2025
C
Verified Purchase
Chris C.
Phoenix, US
★★★★★ 1
Will be returned as soon as I have a replacement.
When engine is cold starter works fine with engine is hot. It will free wheel the starter motor, but not kick the starter gear into the ring gear on the motor. Watch video and listen it actually did it twice at this location but I didn’t catch the first one on the video.
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Reviewed in the United States on December 25, 2025
J
Verified Purchase
Jesus morales
Lowell, US
★★★★★ 5
Good fit
Works great and very affordable price
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 30, 2025
B
Verified Purchase
Billy snead
Waukegan, US
★★★★★ 4
Reasonably priced easy to install starter
Install starter went on pretty easy so far so had it on a few days now and it’s working.
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Reviewed in the United States on August 12, 2025
R
Verified Purchase
Ricky J. Umbarger
San Leandro, US
★★★★★ 5
fits well
went into my sisters 05 ford focus fit well and took about 45 min. to install. also a very good price.
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Reviewed in the United States on February 21, 2024

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