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Satisfaction Guarantee

We want you to be happy with your purchase. If you’re not completely satisfied with your NBI order, simply follow the return instructions below to receive a full refund, excluding shipping charges where applicable. 

But we’re going even further to stand behind our products. Dr. Neustadt started NBI because he needed products to help his patients. That’s why NBI products give demonstrable results. So we’ve taken that research and 15 years of experience shipping dietary supplements to people in more than a dozen countries and created unmatched guarantees for our products.

General Refund and Return Policy

If you’re not absolutely thrilled with any of our NBI dietary supplements, for any reason, simply return the bottle (even if empty) within 60 days of receipt of purchase for a refund of your purchase price (less any applicable shipping charges).

To ensure that we can issue your refund quickly, please follow the return instructions.

  • NBI refunds the purchase price of NBI dietary supplements purchased directly from the NBI online store ( If you purchased NBI dietary supplements through a different website or company, you must contact that company for your refund.
  • Customers are responsible for shipping items back to NBI.
  • NBI will refund the purchase price for the dietary supplements. NBI does not refund shipping & handling.
  • Dietary supplements must be returned in the original containers.
  • Dietary supplements must be shipped back to NBI within 60 days of the date the product was delivered.
  • If you have the original packing slip, include that in the box when you ship back your purchase and make a note as to why you are returning the product.
  • If you don’t have your original packing slip, include a note in the box with your name, phone number and email address used when making the purchase. We use this information to lookup your account. If we can’t locate your account, we won’t be able to verify the purchase or process your refund. Please let us know on the enclosed paper why you’re returning the purchase.
  • Refunds are only given for bottles of dietary supplements shipped back to NBI. Full, unopened bottles, partially full or empty. It doesn’t matter. If you ship it back to us within 60 days after your purchase is delivered, we’ll process a refund.
  • Refunds will only be issued upon receipt of returned items to NBI and if all the requirements of this Return Policy are met.
  • Refunds are issued only to the credit card used to make the purchase.
  • Refunds are typically processed within 5 business days of receiving the products back into our warehouse.

Ship items to: NBI Returns Department, 297 State Street, North Haven, CT  06473


NBI Strong Bones Guarantee

Your “Strong Bones” Guarantee. When you want the best, you want Osteo-K and Osteo-K Minis. That’s not just our opinion. That’s the conclusion of more than 25 clinical trials with over 7000 volunteers showing that the nutrients in our products—MK4 (45 mg/day), calcium and vitamin D3—give you unparalleled bone support.

MK4 (45 mg/day), calcium and vitamin D promote healthy bone density, healthy bone matrix, healthy bone marrow and maintain strong bones as indicated by more than 70% fewer fractures in clinical trial volunteers. We’re so convinced by the research that we’re giving you an unmatched guarantee.

If your follow up scans do not show that bone density has stabilized in your hip or spine, or your hip or spine bone density hasn’t increased, we’ll refund all the money you spent on Osteo-K and Osteo-K Minis between those two scans.

But since a bone density test only predicts 44% of women who will break a bone and only 21% of men, the NBI “Strong Bones” Guarantee does more than just guarantee a test result. The most important indicator of strong bones is whether someone breaks one. Therefore, if you break a bone between scans, we’ll refund all the money you spent on Osteo-K and Osteo-K Minis between those two scans.

All you need to do take Osteo-K or Osteo-K Minis for at least six consecutive months between bone scans and compare your results to your earlier scan.

When you’re doing bone density (DEXA) scans, it’s important to use the same machine at the same clinic to get the most accurate results. Otherwise, the results are not directly comparable. Doctors typically recommend a repeat bone density tests every 18-24 months, but you can ask for one earlier.

Here’s How it Works:

  1. Establish your baseline bone density. This is the last bone density test you will have taken before starting Osteo-K or Osteo-K Minis. To qualify for the guarantee, the baseline bone density test must be taken within 30 days of starting Osteo-K or Osteo-K Minis. If your DEXA scan was more than 30 days ago, your guaranteed period starts from your next scan onward.
  2. Take Osteo-K or Osteo-K Minis at the full daily dose as directed on the bottle for at least six months between bone scans. If you decide to change products at any point, that’s OK. Both products powerfully promote bone health, so as long as you continually take one of them as directed, you’re covered by the guarantee.
  3. Get your follow up DEXA scan from the same clinic as your first scan. That can be six, 12 or even 24 months after you start—as long as you have continued to use your products between scans.
  4. Continue to take Osteo-K or Osteo-K Minis at the full daily dose as directed on the bottle and continue getting follow up bone density scans no longer than every 24 months apart to monitor your bone health.

The NBI “Strong Bones” Guarantee does not extend to and cover broken bones that are incurred from dangerous and/or strenuous activities, such as, including, but not limited to, football, rugby, soccer, and other contact sports; rock climbing, hang gliding, skydiving, and other extreme sports; and other “out-of-the-ordinary” physical activities. 

Best Catch Omegas Guarantee

NBI Strong Bones Guarantee

Our “Best Catch” Guarantee means we guarantee our omega-3 product is the best on the market and will improve your health or get your money back. Omega-3 fatty acids are important for cardiovascular, brain and immune health. 

Since omega-3 fatty acids are incorporated into your cell membranes, the omega-3 index test can determine if you have healthy levels. This blood test is done with a simple finger prick and measures how much EPA and DHA are in your red blood cell membranes. The test result is reported as a percent of all fatty acids. For maximum health benefits, an omega-3 index, researchers have proposed that an optimal omega-3 index is greater than 8%. The average omega-3 index in the United States is only about 4-5%, leaving lots of room for improvement. 

And that’s exactly what Best Catch Omegas will do—improve your omega-3 index. Guaranteed. 

Here’s How it Works:

  1. Establish your baseline omega-3 status by taking an omega-3 index test. To qualify for the guarantee, the baseline omega-3 index test must be taken within 30 days of starting Best Catch Omegas. If your omega-3 index test was more than 30 days ago, your guaranteed period starts from your next omega-3 index  test onward. 
  2. Take Best Catch Omegas at its full dose as directed for at least three months between omega-3 index tests. 
  3. Get your follow up omega-3 index test from the same lab as your first test. That way the two tests are directly comparable. 

If your follow up omega-3 index test does not show that your omega-3 index has improved, we’ll refund all the money you spent on Best Catch Omegas between those two tests.