KOS.com Promo Codes & Coupons September 2025

If your KOS.com promo code isn’t working, it’s usually due to reasons like code expiration, product exclusions, minimum purchase requirements, or entering the code incorrectly. The most common error messages include “Code not valid,” “Code expired,” or “Code not applicable to items in your cart.”

Codes may only work on specific products or collections, and many are not valid on sale items, bundles, or subscription orders. Double-check for typos, extra spaces, or case sensitivity when entering your code. Also, some codes are single-use or limited to one per customer, and you can’t use more than one code per order. If your code is for a special group (like military discounts), you may need to verify eligibility before use.

Pro tip: Always copy and paste codes directly from SimplyCodes, and check the code’s terms and expiration date before applying at checkout.

Yes, KOS.com promo codes often come with restrictions such as expiration dates, product exclusions, and usage limits. Many codes are valid only for one-time purchases and cannot be applied to subscription orders or certain sale items. Some codes are exclusive to specific product categories (like plant-based proteins) or require a minimum spend.

Codes may also be limited to new customers, single-use per account, or restricted to verified groups (e.g., military discounts require verification through VerifyPass and are limited to one code per 24 hours). Expiration dates are usually listed with the code, and expired codes will trigger an error at checkout.

Pro tip: Always review the promo code’s terms and conditions on SimplyCodes before shopping, and use your code as soon as possible to avoid missing out due to expiration.

No, KOS.com does not allow stacking or combining multiple promo codes on a single order. Their checkout system only accepts one promo code per transaction, and entering a second code will override the first.

This is a common restriction for KOS.com, and you’ll see an error if you try to apply more than one code. Choose the code that gives you the best discount or applies to the most items in your cart.

Pro tip: Calculate which code offers the highest savings for your order before checking out, especially if you have codes with different discount amounts or product eligibility.

Yes, KOS.com frequently offers promo codes for first-time buyers and new email subscribers. When you join their mailing list, you’ll often receive a welcome discount code (commonly 15% off) to use on your first order. These codes are typically single-use and may have product or purchase minimum restrictions.

You may also see pop-ups or banners on the site inviting you to sign up for exclusive offers, and these codes are usually delivered instantly or within a few minutes to your inbox. Make sure to check your spam or promotions folder if you don’t see the email right away.

Pro tip: Sign up for the KOS.com newsletter before shopping to unlock the best first-time buyer discounts and stay updated on future promotions.

In the past month, KOS.com has launched 11 new promo coupons for shopper discounts. This indicates that KOS.com provides regular opportunities for customers to save money on their purchases.

On average, KOS.com provides 4.3 discount coupons each month. Based on historical data, the average time between KOS.com coupon releases is approximately 7 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 KOS.com website regularly, subscribing to their email newsletter, and following them on social media.

KOS.com is offering 45 working store-wide codes, and they are also offering 50 additional discount codes with a max discount of 20% off.

SimplyCodes is the #1 provider of discount codes for your favorite retailers, such as KOS.com. 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 KOS.com discount codes.

On average, KOS.com offers 4.3 coupon codes per month. As of today, KOS.com has 50 active coupons and offers.

As of Sep 9, 2025, it does not appear that KOS.com has discounts for Black Friday or Cyber Monday. We regularly check for KOS.com's Black Friday and Cyber Monday discounts, so be sure to check back on this page to find the latest cyber week deals.