Cancel your Muscle Booster subscription by mail
Muscle Booster accepts cancellations by mailed letter and by email at support@musclebooster.fitness; the letter gives you the dated paper record. Letters to Muscle Booster go to Limassol, Cyprus.
Let Postbye cancel Muscle Booster for you
We write your letter, mail it by certified mail the next business day, and confirm when the cancellation went through. You keep the signed proof.
Money-back guarantee within 10 business days.
Postbye is not affiliated with Muscle Booster.
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- 2 Muscle Booster cancellations handled this month
- Certified mail with tracking
- Mailed every business day
- Delivery proof sent to you
- We confirm your cancellation
How to cancel Muscle Booster by mail
Gather your account details
Start with the account email, the plan name and any pending order or prescription reference, so the request to Muscle Booster names the right account the first time.
Put the request in writing
Ask Muscle Booster to cancel the account, stop all further charges and confirm in writing. Postbye prepares the letter from our English template, with the subject line “Subject: Cancellation Request – [your name]”.
Send it by certified mail
Take the letter to the post office and ask for certified delivery to 3032 Limassol. Keep the tracking number it gives you.
Send the email copy
Email support@musclebooster.fitness with the same request and keep the sent message. The email is fast; the letter is the dated proof.
Hold on to the receipt
The receipt dates your request. Look at your next statement for any Muscle Booster charge after that date.
With Postbye, steps 2 to 4 take about two minutes of your time.
Where your Muscle Booster cancellation letter goes
Written requests to Muscle Booster go to Karaiskaki 13, 3032 Limassol, Cyprus.
The postcode 3032 belongs to Limassol, Cyprus, so this is where the envelope is delivered.
Your name, address and email appear in a short block labelled Account holder, Billing address on file and Email on file, under the greeting “To Whom It May Concern,”.
Prefer to write it yourself? Use our letter template
Every address we hold for Muscle Booster, with the envelope wording
Before you cancel Muscle Booster, check these
- Ask for written confirmation, and check the next statement for further charges.
- Pending shipments or refills may already be processed. Ask what can still be stopped.
- Prescriptions are separate from the subscription. Check how to transfer or end them.
Several states set rules for subscriptions that renew on their own. See what yours requires in automatic renewal laws by state.
Let Postbye cancel Muscle Booster for you
We write your letter, mail it by certified mail the next business day, and confirm when the cancellation went through. You keep the signed proof.
Cancelling a health or wellness subscription
Health and wellness plans combine a monthly fee with supplies or consultations, so the request should say what to stop: the plan, pending shipments or both.
Because the company takes post and email, sending both removes any argument about which one it received first.
Muscle Booster cancellation at a glance
- How Muscle Booster accepts cancellations
- By mailed letter or by email
- Mailing address on file
- Muscle Booster Karaiskaki 13 3032 Limassol Cyprus
- Country
- Cyprus
- Letter language
- English (template en-generic)
- Cancellation email
- support@musclebooster.fitness
- Category (from the company name)
- Health & wellness
- Added to the database
- June 19, 2026
- Data last checked
