Flex is a payment partner that makes it simple to use your HSA or FSA funds at checkout. Select "Flex | Pay with HSA/FSA" as your payment method, complete a brief health assessment, and enter your HSA/FSA card to complete your purchase​. Flex automatically emails you an itemized receipt and Letter of Medical Necessity for your records​.

Omega-3 supplements may be eligible when recommended by a medical practitioner to treat a specific diagnosed condition. Flex streamlines this by facilitating a quick eligibility assessment at checkout and providing the necessary Letter of Medical Necessity automatically.

No problem. Pay with a regular credit or debit card at checkout, and Flex will send you an itemized receipt that you can submit to your HSA or FSA provider for reimbursement.​

The most common reasons are insufficient funds in your account or incorrect card information. HSA/FSA cards are debit cards, so check your available balance with your administrator. If issues persist, pay with a regular card and submit for reimbursement instead.​

Check your spam folder for emails from notifications@withflex.com. If you still can't find it, contact Flex at support@withflex.com with your order email address, and they'll resend your documentation.

FSA funds typically must be used within the plan year due to "use-it-or-lose-it" rules. HSAs are more flexible and usually allow reimbursement for expenses from previous years. Always check with your specific administrator about their reimbursement timelines.

Your pre-tax dollars deserve pharmaceutical-grade, sustainably sourced Omega-3s that your body actually absorbs. With Flex, using those funds is completely hassle-free—no reimbursement runaround, just pure wellness at an affordable price with clinically effective doses you'll actually enjoy taking.