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Deflect - Lectin Blocker (Blood Type O)

37 Customer Reviews Write a Review

The original shield against lectins. Designed to block problematic food lectins known to negatively impact Blood Type Os.

Select your blood type: O A B AB

Sometimes, Avoids are simply unavoidable.

Meet Deflect O, your first line of defense against lectins in Avoid foods. A class of proteins that bind to the different antigens in each blood type, lectins can harm immune and digestive function. This causes a variety of health problems including intestinal and bowel irritation, bloating, weight gain and lethargy. Shielding your biology from these dangerous molecules is important.

An exclusive blend of glucosamine, bladderwrack and sodium alginate, Deflect O is crafted for optimal absorption by Blood Type Os. Dr. D'Adamo's uniquely designed formula provides specific blocking sugars that attach to receptors on lectins, preventing them from weakening immune and digestive health.

  • Knocks out specific Type O dietary lectins before they hinder digestion
  • Boosts metabolism
  • Reinforces immune defenses

Our lectin-fighting team includes:

N-Acetyl D-Glucosamine (NAG)
Acts like a magnet for lectins in foods such as wheat and other grains. When lectins bind to the NAG on your cells, they impair their functioning and promote inflammation.The NAG in Deflect serves as a distractor, picking up stray lectins without interrupting your metabolism.

Bladderwrack (Fucus vesiculosus)
Binds to unfriendly bacteria and viruses such as meningococcal bacteria which causes bacterial meningitis herpes simplex, E. coli and several strains of Candida. When bladderwrack attaches to harmful microbes, it prevents them from sticking to the intestinal tract, where they can hinder digestive functioning.

Sodium Alginate
Binds lectins in the digestive tract and prevents their absorption. A natural polysaccharide product extracted from brown seaweed that grows in cold water regions, its binding properties come from its solubility in cold and hot water with strong agitation, which makes it thicken and bind.

Click the Play button to hear to Dr. Peter J. D'Adamo discuss Deflect.

While it can't magically turn Avoids into Beneficials, Deflect O may assist in healthy weight loss and the repair of pre-existing lectin damage. With the help of our formula, you can support a balanced digestive system.

Dosage & Information

For maximum benefit: take two (2) capsules two to three times daily with meals
(As a dietary supplement or as directed by a physician)

120 vegetarian capsules
Is this Product Vegetarian? No
Contains crustacean from N-acetyl D-glucosamine (isolated from crab shell)

Does not contain: sugar, salt, gluten, wheat, yeast, corn, soy, eggs, dairy, preservatives, color, flavors or artificial ingredients

For California Residents

Prop 65 Warning

WARNING: Consuming this product can expose you to Lead, which is known to the State of California to cause birth defects or other reproductive harm. For more information go to


Recommended Reading

Following The Blood Type Diet On the Go Lectins & Blood Types The “Fad Diet” That Might Just Save Your Life
Write a Review
  • Excellent for calming the stomach

    Posted by Charlotte D. on Apr 25th, 2018

    I have been taking deflect o's for many years now. It is excellent for calming my stomach after eating avoid foods and great for my thyroid (which can be sluggish at times). I love deflect o and highly recommend it.

  • Deflect O - Amazing - has helped me so much

    Posted by Rosa Henshaw on Nov 3rd, 2017

    I am on my 4th bottle of Deflect O, created my account with the third purchase I believe because this product helped me so much like nothing I have ever used before! I mean that sincerely. Let me tell you that I am o negative, and I was 242 pounds when I started the eat right for your type diet back in late June. I also had digestive issues, from bloating to diarrhea daily, NA fatty liver disease, and was almost diabetic. I am now 182 pounds at about 5 and 1/2 months into the program and I have so much energy now. I feel so much better too. The digestive issues have all but disappeared, my sugar is normal-so no diabetes in my horizon, and my liver is on the mend. I am not taking any medication now and I was on about 8 different prescription meds before. I can't tell you how much I appreciate finding this diet and the supplements. I needed the supplements too because my thyroid also does not function properly and they help it naturally and I don't need meds. I am here for the rest of my life and I think it's going to be better than ever. Thanks Dr. D.

  • Won't do without it!

    Posted by Bonnie on May 22nd, 2017

    I had not taken Deflect for several years, and was getting mild headaches after eating, even tho' I eat only foods Beneficial for my Genotype. I started taking 2 capsules with each meal, gradually increasing from 1 capsule per meal and my symptoms have vanished! I am so pleased.

  • Love this product!!

    Posted by Linda Dancy on Feb 7th, 2017

    Really saves me when I don't eat right, even though its not very often.

  • Lectin Fighter

    Posted by Chamaine C. on Jan 19th, 2017

    I rely on my Deflect for hidden ingredients that msy be damaging to my digestive system. Ingredients like gums, typically found in plant based milks, carrageenan, arabic or guar gums. Also, corn or coconut by-products also added where the fine print on labels makes it hard to read. I follow the blood type diet as closely as possible without depriving myself of dishes I really enjoy. That's when my Deflect is a super weapon.

  • No complaints

    Posted by Beatrice on Jul 13th, 2016

    I've not taken it for long, but I have not issues with it so thats a good thing.

  • Be Careful it's Amazing

    Posted by Ramie on Mar 25th, 2016

    I can get caught up and eat the wrong foods for me; because I have this amazing supplement. It is a great product to have on hand for the occasional avoid list.

  • Awesome

    Posted by Pennie on Nov 23rd, 2015

    Is a life savor! Can really tell the difference when I am not using it. Thank You for a great product!

  • No More Morning Lethargy

    Posted by Scott on Nov 11th, 2015

    I'm only on my second bottle of the deflect "O" and here's what I've noticed. First, I will say that I haven't been 100% compliant to the BTD probably more like 75 to 90%. The main thing is that when I wake up in the morning after the previous day of maybe a lower percentage of compliance I don't seem to have what I call a hang over like experience... foggy head, lethargy, stuffy sinuses. I do feel brighter, clearer, and more ready to take on the day. I am grateful for that! I take this as a confirmation of the need to adhere more closely to diet for my type "O" needs. When I do, I seem to build on those positive feelings. I have confidence that this product works as stated and I will be continuing to use it daily.

  • In conjunction w/ Polyflora

    Posted by Anonymous on Oct 25th, 2015

    Like the other reviewer I'm not sure exactly how this works but it seems to be doing what the summary suggests in conjunction w/ Polyflora. I never feel bloated anymore and I only take 2 once a day unlike others. I can't say its curbed my appetite but I'm only a couple weeks in.

  • Deflect O

    Posted by Anonymous on Oct 2nd, 2015

    Love it!


    Posted by Beverly on Jun 9th, 2015

    I am feeling much better since I started using DEFLECT O. I am trying to eat more of the foods for my blood type O. But even when I don't I notice I still feel great and do not get that lethargic feeling I used to get after eating foods that are not for my blood type. I am also sleeping better.

Practitioner Technical Information

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Deflect O TRM

Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.


We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

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