Onnit Promo Codes & Coupons September 2025

If your Onnit promo code isn’t working, it’s usually due to an expired code, a typo, or not meeting the code’s specific requirements. Onnit’s checkout will display an error message such as “Invalid code” or “Code expired” if there’s an issue.

Common reasons for promo code failure include:

• Entering the code incorrectly (extra spaces or wrong characters)
• The code has expired or is no longer valid
• Your cart doesn’t meet the minimum purchase amount or other restrictions
• The code is not applicable to the items in your cart (some codes exclude certain products or categories)
• Attempting to use more than one promo code per order

To fix this:

1. Double-check the code for typos and ensure it’s still valid.
2. Review the code’s terms—look for minimum spend or product exclusions.
3. Try removing any ineligible items from your cart.
4. If the code still doesn’t work, try a different verified code from a reputable source like SimplyCodes, which tracks real-time success rates.

Pro tip: Always copy and paste codes directly to avoid typos, and check the code’s expiration date before applying.

No, Onnit does not allow stacking of promo codes—only one promo code can be used per order. If you try to enter a second code, the system will replace the first one.

However, Onnit does allow you to combine a single promo code with other types of offers, such as:

• Subscription discounts (e.g., 15% off supplements with a subscription)
• Free shipping promotions

This means you can maximize savings by using a promo code alongside these automatic discounts, but you cannot enter two promo codes at checkout.

Pro tip: Combine your best promo code with a subscription or sitewide deal for the biggest discount.

Yes, Onnit promo codes often come with exclusions and restrictions. Common limitations include:

• Some codes are only valid on specific products (e.g., Alpha Brain or supplements)
• Subscription items may already be discounted and might not accept additional promo codes
• Certain codes require a minimum purchase amount
• Community discounts (for military, teachers, etc.) are sitewide but may not stack with other codes

Always check the terms and conditions of each code. At checkout, if an item is excluded, you may see an error or the discount may not apply to those products.

Pro tip: Review the fine print of each promo code and check your cart for ineligible items before applying the code.

Once an Onnit promo code has expired, it cannot be used—the checkout will display an error like “Code expired” or “Invalid code.” Onnit’s system enforces expiration dates strictly, and there are no exceptions for late use.

If your code has expired:

• Search for a new, active promo code on trusted coupon sites like SimplyCodes, which list current codes and track their success rates.
• Sign up for Onnit’s email list or check their homepage for new promotions, as they frequently release new codes and deals.

Pro tip: Set reminders for promo code expiration dates and always check for new codes before completing your purchase.

Onnit may occasionally offer discount codes, but currently, there are none available. However, customers can still save money by taking advantage of other promotional offers or sales available on the website, or by using credit card points to make purchases.

We couldn't find any available data on how often Onnit releases new discount codes. Based on historical data, the average time between Onnit coupon releases is approximately 30+ 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 Onnit website regularly, subscribing to their email newsletter, and following them on social media.

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

Onnit offers coupons occasionally.

Onnit offers discounts during Black Friday, where shoppers can save extra on limited-time sales. Check out their deals here!