MuscleSport Promo Codes & Coupons February 2026

Your MuscleSport promo code likely shows "invalid" because it's expired, already used on your account, restricted to specific items, or entered incorrectly in the checkout's "Discount Code" field.

Common scenarios include codes like AFF-WETHRIFT or HASS705 failing if past their usage limit or not for your cart items. MuscleSport codes often expire after weeks/months, with regular verification cycles. To fix the issue:

1. Copy-paste the code exactly as shown on coupon sites to avoid typos
2. Remove sale or clearance items from your cart as they may conflict with the code
3. Clear your cart completely, re-add items, and apply the code before shipping information
4. Try MuscleSport's welcome 10% signup code if other codes fail

MuscleSport allows only one code per order with no stacking, and many codes have specific product restrictions.

Pro tip: Test codes on a single regular-priced item first to isolate any issues, then shop during Daily Deals for maximum savings without code conflicts.

No, MuscleSport does not allow combining multiple promo codes on one order—you can only apply one at checkout.

This policy prevents stacking discounts, as confirmed by their Discounts and Exclusions page. When you try to use multiple codes (like AFF-WETHRIFT plus another code), the system will show an error. To get the best discount:

1. Compare available codes to find the highest value one for your purchase
2. Enter only that code in the checkout's promo box and hit "Apply"
3. Understand that even special codes like military/first-responder discounts (35%) follow the single-code rule

Most codes apply site-wide but cannot be combined with items already on sale.

Pro tip: Compare code values before checkout and use the best one during free shipping promotions on orders over $75 to maximize your savings.

Most MuscleSport promo codes do not apply to sale or clearance items, as per their official Discounts and Exclusions policy.

Shoppers frequently encounter "invalid code" errors when trying to use discount codes on Daily Deals or clearance items. This happens because MuscleSport's system prevents stacking multiple discounts on already-reduced merchandise. To check compatibility:

1. Review the code details on coupon sites (look for "excludes sale items" notes)
2. Add your desired items to cart and proceed to checkout
3. Apply your code—if you get an error message, try removing sale items
4. Check for specific exclusions (some codes like MILLERFIT exclude bundles)

Sale promotions may end early if stock depletes, so act quickly on those deals.

Pro tip: To maximize savings, consider using a non-sale code with regular-priced items and adding Daily Deal items to the same order to hit the $75 free shipping threshold.

If your code isn't applying to MuscleSport subscriptions, it's likely because many codes exclude recurring orders or bundles. This is a common limitation with supplement subscription services.

To work around this issue:

1. Switch your cart items to one-time purchase temporarily
2. Apply your discount code (try site-wide codes like the 15% options)
3. Complete your purchase with the discount
4. Set up a subscription for future orders afterward
5. If needed, contact MuscleSport support via their site chat for assistance with overrides

Subscription products often bypass promotional discounts as they already offer savings through the recurring purchase model.

Pro tip: Start with a discounted one-time order using the welcome signup code, then set up auto-ship for future orders to benefit from both initial savings and loyalty perks.

Check the code description on coupon sites like Knoji or Wethrift—first-time restrictions are typically clearly labeled (such as "welcome 10% signup code"). You can also identify these restrictions when you see "account already used" errors at checkout.

To determine if a code is for new customers only:

1. Look for "first-time" or "new customers" tags in the code description
2. Try using incognito mode with a new email address to test the code
3. If you get an error with your existing account, look for affiliate codes like AFF-WETHRIFT which often have broader eligibility

Military and first responder codes aren't typically first-time restricted but require verification of status. Welcome codes offering 10% off are almost always limited to new signups only.

Pro tip: Consider signing up with a secondary email address to access first-time customer exclusives, then contact support to merge your accounts for order history tracking.

MuscleSport occasionally issues discount codes to shoppers. In the past month, they have launched 2 new promo coupons. While the availability of these codes may vary, customers should regularly check MuscleSport website or sign up for their email newsletter to stay informed about new discounts.

On average, MuscleSport provides 2.6 discount coupons each month. Based on historical data, the average time between MuscleSport coupon releases is approximately 12 days. However, this is subject to change and may depend on various factors such as seasonal promotions, product launches, or other marketing initiatives. To stay informed about upcoming discounts and promotions, we recommend checking MuscleSport website regularly, subscribing to their email newsletter, and following them on social media.

MuscleSport is offering 12 working store-wide codes, and they are also offering 20 additional discount codes with a max discount of 10% off.

SimplyCodes is the #1 provider of discount codes for your favorite retailers, such as MuscleSport. As the only crowdsourced platform for coupon codes, we have all the latest and accurate codes for over 200,000 stores. Save time and avoid expired codes by checking SimplyCodes for the latest MuscleSport discount codes.

On average, MuscleSport offers 2.6 coupon codes per month. As of today, MuscleSport has 20 active coupons and offers.

As of Feb 8, 2026, it does not appear that MuscleSport has discounts for Black Friday or Cyber Monday. We regularly check for MuscleSport's Black Friday and Cyber Monday discounts, so be sure to check back on this page to find the latest cyber week deals.