27 Days Left: Don’t Let FSA Dollars Expire!

Brands: Partner with us now to capture this spend before it disappears -> Get Started

Days Left: Don’t Let FSA Dollars Expire!

For Business

For Shoppers

For Business

For Shoppers

For Business

For Shoppers

Flex for

supplements Brands

Flex for

supplements Brands

Flex for

supplements Brands

Unlock new revenue by making your supplements HSA/FSA eligible

Boost checkout conversion by 30% and AOV by 50% with the only HSA/FSA payments solution built for leading supplements brands

Trusted by top supplements brands

The Problem

The missed opportunity in supplement health benefit spending

Most customers don’t realize many supplements—like vitamins, probiotics, and other products—can qualify for HSA/FSA spending. That means over $150B in consumer health funds often goes unused, leaving supplement brands with missed revenue. Even informed shoppers face friction from reimbursement forms and approval delays, leading to frustration and checkout drop-off.

Frustrated customers

Eligibility confusion

Frustrated customers

Eligibility confusion

Abandoned carts

Manual claims

Abandoned carts

Manual claims

Out-of-pocket spend

Reimbursement wait

Out-of-pocket spend

Reimbursement wait

No LMN access

Payment declines

No LMN access

Payment declines

Lost HSA dollars

Checkout drop-off

Lost HSA dollars

Checkout drop-off

Automatic eligibility

Instant LMN

Automatic eligibility

Instant LMN

Direct HSA/FSA pay

Seamless checkout

Direct HSA/FSA pay

Seamless checkout

Lower customer costs

Satisfied customers

Lower customer costs

Satisfied customers

Completed purchases

Faster approvals

Completed purchases

Faster approvals

Streamlined access

Captured HSA dollars

Streamlined access

Captured HSA dollars

The Solution

Your all-in-one HSA/FSA payment solution for supplements

Flex helps supplement brands unlock the $150B+ HSA/FSA market through seamless, end-to-end checkout. We verify product eligibility, enable direct HSA/FSA payments, and instantly generate Letters of Medical Necessity when required. The result: higher conversions, larger orders, and happier customers who can save on the supplements that keep them healthy every day.

Effortless HSA/FSA payments

Enable seamless HSA/FSA payments for supplements products in-app or on your website. We handle the complexity of split cards, subscriptions, and more.

Autopilot compliance

Automatically verify supplements product HSA/FSA eligibility before and after your customers purchase. We automatically generate a Letter of Medical Necessity if required to stay in compliance.

Smarter insights

Access powerful dashboards and insights to identify your customers' spending trends and generate more revenue.

Why Flex

HSA/FSA eligibility made simple for supplements

Boost conversion and increase order value

Flex’s streamlined checkout drives up to 30% higher conversion and 50% higher AOV by letting customers pay for supplements and nutrition products directly with their benefits.

Monthly Overview

Ura supplements

Time Period

Q3, FY25-26

Conversion %

12.4%

29%

AOV

$1034.00

48%

Top Benefit Plans Opted

30%

20%

10%

40%

supplements Membership

End-to-end solution to accept HSA/FSA payments for supplements

Flex automatically verifies supplements & nutrition product eligibility, processes HSA/FSA cards, and generates LMNs in under a minute—removing the paperwork and frustration that cause drop-off.

Latest Orders

Cart

John Doe

Invoice #32414

Letter of Medical Necessity

Checkout

Payouts

Easy-to-integrate solution for enterprise and smaller brands

Whether you’re on Shopify, another ecommerce platform, or running custom checkout flows, Flex fits seamlessly into your stack. Most supplements brands launch in less than a day.

Trusted, experienced team

From setup to scale, our team ensures you get live quickly, implement best practices, and capture demand. Plus, we’ll feature your brand across our channels to our high-intent HSA/FSA shoppers.

The Impact

Why our customers love Flex

Conversion Lift

+30%

More shoppers complete checkout with HSA/FSA

Conversion Lift

+30%

More shoppers complete checkout with HSA/FSA

Conversion Lift

+30%

More shoppers complete checkout with HSA/FSA

AOV Lift

+50%

Customers spend more using health benefit funds

AOV Lift

+50%

Customers spend more using health benefit funds

AOV Lift

+50%

Customers spend more using health benefit funds

Fewer Returns

-10%

Fewer returns when buyers use pre-tax dollars

Fewer Returns

-10%

Fewer returns when buyers use pre-tax dollars

Fewer Returns

-10%

Fewer returns when buyers use pre-tax dollars

Repeat Buyers

+92%

Of customers said they'll return because of HSA/FSA

Repeat Buyers

+92%

Of customers said they'll return because of HSA/FSA

Repeat Buyers

+92%

Of customers said they'll return because of HSA/FSA

The marketing materials Flex provided were phenomenal. We used their landing page and email examples as inspiration, layered in our branding, and saw campaigns perform better than almost anything else,

Paige Smith

Head of Brand Marketing, AMMD by Amy Meyers MD

The marketing materials Flex provided were phenomenal. We used their landing page and email examples as inspiration, layered in our branding, and saw campaigns perform better than almost anything else,

Paige Smith

Head of Brand Marketing, AMMD by Amy Meyers MD

The marketing materials Flex provided were phenomenal. We used their landing page and email examples as inspiration, layered in our branding, and saw campaigns perform better than almost anything else,

Paige Smith

Head of Brand Marketing, AMMD by Amy Meyers MD

FAQs

Need more help? Reach out to a Flex Specialist today.

What is HSA/FSA?

Health Savings Accounts (HSAs) and Flexible Spending Accounts (FSAs) are tax-advantaged accounts that allow individuals to set aside pre-tax dollars for qualified medical expenses. Many Americans use these accounts to pay for everyday health-related purchases—including eligible sleep wellness products like mattresses, bedding, sleep tech, and clinical sleep aids.

What is HSA/FSA?

How do I know if the supplements I sell are HSA/FSA eligible?

Flex automatically verifies the eligibility of each supplement and wellness product you sell, and will flag which ones can be made HSA/FSA eligible—with or without a Letter of Medical Necessity (LMN).

How do I know if the supplements I sell are HSA/FSA eligible?

Can Flex help my customers get a Letter of Medical Necessity (LMN) for supplements during checkout?

Yes! While your customers are shopping for supplements that are HSA/FSA eligible with a Letter of Medical Necessity, they can connect directly with a healthcare practitioner that can provide one instantly. LMNs are emailed to customers within 24 hours.

Can Flex help my customers get a Letter of Medical Necessity (LMN) for supplements during checkout?

What types of supplement products can I sell that are typically HSA/FSA eligible?

General Wellness Supplements

Supplements taken to support overall health and fill dietary gaps in essential vitamins and nutrients