What Is Ensure
Ensure is Abbott's line of bottled nutrition shakes, clear drinks and powders. The familiar chocolate or vanilla bottle comes in several versions: Original, higher-calorie Plus, and COMPLETE with 30 grams of protein. Abbott also sells muscle-support products and a shake designed for surgical recovery.
You can buy directly from Abbott. Its regular price for a case of 24 Ensure Plus Milk Chocolate shakes, each 8 fluid ounces, is $64.63 as checked in October 2026.
Ensure shakes, drinks and powders are nutritional supplements. The National Cancer Institute names Ensure among the nutrition supplements to try for appetite loss and weight loss during cancer treatment.
Why Ensure Qualifies for HSA/FSA
Ensure qualifies with a Letter of Medical Necessity (LMN) documenting its use to treat your health condition.
IRS guidance on nutritional supplements (Q14) counts them as a medical expense when they are "recommended by a medical practitioner as treatment for a specific medical condition diagnosed by a physician," and Publication 502 states the same rule in its Nutritional Supplements entry. Your LMN documents that recommendation, so what you pay for Ensure counts.
A shake added to meals for a diagnosed health condition is the clearest medical-use example. Abbott identifies nutritional risk, involuntary weight loss and recovery from illness or surgery among Ensure's uses.
- Malnutrition. Cleveland Clinic describes nutritional supplementation as treatment for undernutrition. Abbott designs Original, Plus and COMPLETE to provide complete, balanced nutrition for people at risk of malnutrition.
- Involuntary weight loss. Abbott markets Ensure Plus to help people gain or maintain weight. Mayo Clinic includes nutrient-dense shakes in weight-gain strategies for people who are underweight, including after illness.
- Recovery after illness, injury or surgery. MedlinePlus advises people who are sick to get enough protein and calories and to ask their provider about liquid nutrition drinks. Cleveland Clinic says healing from surgery or injury takes extra calories and protein, and it lists protein shakes, with your provider's OK, among the ways to get it. Abbott designs Ensure Surgery to support recovery from surgery, taken under medical supervision in addition to your normal diet.
- Sarcopenia, or muscle loss. Abbott's Max Protein 2-in-1 Muscle Support contains protein and HMB for muscle preservation. A 2024 systematic review of six studies found that HMB or HMB-containing nutritional supplements improved handgrip strength in people with sarcopenia.
How to Get Ensure Covered With a Letter of Medical Necessity
You can get a Letter of Medical Necessity for Ensure one of two ways:
- Through Crates, typically in under 24 hours. After you spend 2 to 3 minutes on the online health assessment, a licensed provider reviews your answers. If you qualify, you receive a letter for Ensure that's valid for 12 months and renews each year.
- Through your own doctor, a few days to a few weeks. Book a visit with the provider who treats your condition, say you want to buy Ensure with HSA/FSA funds, and ask them to document how nutrition shakes help prevent, manage, or reverse it. Have them sign and date the letter. Your plan may charge a copay for the appointment.
How to Buy Ensure With HSA/FSA Funds
Buy Ensure wherever you like, then get your HSA/FSA funds back in three steps:
- Get your LMN first. Use Crates or your own doctor, as above, before you buy.
- Buy Ensure anywhere. Use your personal card when you order online or shop in store. Save the itemized receipt that lists your Ensure purchase and the amount paid; for an HSA, keep it and the letter with your tax records.
- Get your funds back. You can have Crates file the claim through one-click reimbursement, or upload the letter and receipt yourself.
Which Ensure Products Qualify
These products are in Abbott's current Ensure lineup. Each qualifies with an LMN for its documented medical use, whichever version your provider recommends.
| Product | What it is | HSA/FSA eligibility |
|---|---|---|
| Ensure Original | Ready-to-drink nutrition shake | Yes, with an LMN |
| Ensure Plus | Higher-calorie nutrition shake | Yes, with an LMN |
| Ensure COMPLETE | Nutrition shake with 30 g protein | Yes, with an LMN |
| Ensure Clear | Fruit-flavored, fat-free nutrition drink | Yes, with an LMN |
| Ensure Original Nutrition Powder | Powder mixed into a nutrition drink | Yes, with an LMN |
| Ensure Max Protein 2-in-1 Muscle Support | Protein-and-HMB nutrition shake | Yes, with an LMN |
| Ensure Surgery | Nutrition shake for surgical recovery | Yes, with an LMN |
| Ensure Max Protein 3-in-1 Muscle Support | Protein, creatine and HMB dietary-supplement powder | Yes, with an LMN |
Abbott identifies 3-in-1 Muscle Support as a dietary supplement. For other brands and formats, our protein powder eligibility guide covers that broader category.
How Much You Can Save on Ensure
Paying with pre-tax HSA or FSA funds saves up to 30% on your Ensure purchases. Your actual savings depend on your tax rates and how you fund the account.
