How To Boost Your Body's Natural Defenses

Our immune system plays a vital role in our overall well being, and most Americans are aware of this. However, millions over 40 years old are at risk because they don’t take care of their immune system properly! 

Chances are, you’ve might have been doing it wrong too..

An apple a day keeps the doctor away, right? Well, it's not that simple... Our immune system needs a lot more than just one apple. The nutritional demands the body has of us are, at times like these, very high. In today’s society where the risk of health becomes a greater concern, we need to know how we can best strengthen our immune system and our overall health.

Along with proper nutrition, sleep, and rest, immune boosters could be your best option to boost your body's natural defense.

Our Choice: Immune Booster 2023

Our Choice

There are plenty of immune boosters on the market today that promise to boost immunity and act as a defense against viruses. Yet it can be difficult to navigate an overwhelming variety of immune boosters, their advertised benefits and ingredients.

We've done the work for you and compiled a review containing our top 5 choices for immune boosters in 2023, including a helpful guide for what to look for and what to avoid in immune boosting supplements.

by Primal Harvest [1]

Based on 3739 Reviews of Primal Harvest

Immune Defense

USA-made in GMP-certified facility

Third Party Lab Tested

Doctor Formulated 

90-Day Money-Back Guarantee

High Doses of Proven Immune Boosting Ingredients 

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1. Primal Immune Defense

by Primal Harvest[1]





USA-made in GMP-certified facility 

"No questions asked" 90-day Money-Back-Guarantee

Doctor-formulated immune booster 

Has powerful immune boosting Lactobacillus acidophilus La-14 and Bifidobacterium bifidum probiotics.

High dosage of Vitamins C, D3, B6

40mg of Zinc

Only available online

Sometimes runs out of Stock

The Bottom Line 

We have no doubt at all about the quality and efficacy of Primal Immune Defense by Primal Harvest. It's a remarkable all-in-one immune support formula that helps maximize your body’s natural defenses. It combines the most important scientifically-backed immune supporting vitamins like C, B6, and D3, with high doses of zinc, prebiotics, and 14 billion CFU’s of high potency Lactobacillus acidophilus LA-14 & Bb-06 probiotics. Backed by scientific research, top-notch ingredients and the 90-day money-back guarantee on it, we are 100% confident in our #1 pick.

Besides aiding healthy immune system, Primal Immune Defense helps with digestion and improving general health. The capsules are extra small, making it easy to consume every single day.

You'll get a highly effective supplement that will supply your body with all the much-vaunted health benefits that Primal Immune Defense can offer. Plus, you can rest assured, the quality is ensured  and backed by independent 3rd party lab tests.

Immune Defense's pricing stands out, especially when you buy multiple bottles. The price drops dramatically and since continued use over months is recommended to achieve the best benefits, buying a 3-6 month supply is a no-brainer.

There’s just a small thing: they get sold out really fast. So we recommend you hurry and place your order if you are now assured that this will be beneficial to your health.

Make a Smarter Choice
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2. Super Power

by Moon Juice



Contains high amounts of vitamin C and zinc

Third party tested

Vegan, Non-GMO

Lacks vitamin B and probiotics

No money back guarantee

Strong unpleasant smell

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3. Umzu Immune




500mg of vitamin C

60 day money back guarantee

No mention of being third party tested 

No probiotics

Lower amounts of zinc

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Best Immune Booster 2023

Latest update: July 28, 2021

4. Advanced Immune Defense

by Immuneti



High in vitamin C

Vegetarian and gluten-free capsules

Contains elderberry and echinacea

Doesn't contain probiotics

Poor quality control

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5. Immune+

by Emergen-C



"Contains a high serving of vitamin C (1000mg)

Easy to travel with

Not a very diverse product. No probiotics.

Basically a vitamin C drink

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Immune boosters can help improve your body's natural defenses

Your Gut Is The Cornerstone Of Your Immune System


Advertiser Disclosure

© 2023 
All Rights Reserved. 

Trademarks utilized on our website belong to their respective owners and no implied or expressed endorsement of our website or services is intended. Rankings can be affected by the relationship Smarter Choices has with our top picks.

[1] we have a financial relationship with some of our top picks and partners


*These statements have not been evaluated by the FDA Food & Drug Administration. These products are not intended to diagnose, treat, cure or prevent any disease. The information provided by this website or this company is not a substitute for a face-to-face consultation with your physician and should not be construed as individual medical advice. The testimonials on this website are individual cases and do not guarantee that you will get the same results. All content, including text, graphics, images and information, contained on or available through this web site is for general information purposes only.

What To Avoid:

Glorified vitamin C supplements

A supplement containing high dosages of just vitamin c is not ideal to boost a complex immune system.

Supplements with no probiotics

70-80% of immune cells live in your gut. Not addressing your gut health is a major oversight.

Unproven vitamins & minerals

It's always better to stick with a supplement containing well researched and scientifically proven ingredients instead of relying on marketing terms.

Extremely Low or High Price

Do your research before buying an overpriced or suspiciously cheap supplement. Do not cut corners for your immune health.

Key Ingredients To Look For

Considering your gut makes 70-80% of the cells in your immune system, probiotics are crucial for long term immune system. In particular LA-14 Lactobacillus Acidophilus probiotic has been heavily researched as the top immune-boosting strain.3


Has been used to fend off and reduce the duration of flu and common cold symptoms for years. Zinc is needed for immune cell development and communication and plays an important role in inflammatory response. We recommend a supplement with at least 20mg of Zinc.4


Vitamin C

The classic Hero of Immunity. Vitamin C contributes to immune defense by supporting various cellular functions of both the innate and adaptive immune system. A good immune boosting supplement contains at least 300 mg of vitamin C.5

Vitamin D is essential for immune function. Healthy levels of this vitamin may help lower  risk of respiratory infections. A good starting point of vitamin D3 is 1000 UI.6

Vitamin D

Vitamin B

B vitamins, including B12 and B6, are important for healthy immune response. Yet, many adults are deficient in them, which may negatively affect immune health.7

The idea of boosting your immune system is alluring, but the ability to do so has proven to be difficult for multiple reasons. The immune system is a system, not a single entity and there is no single solution. To function well, your immune system requires balance and harmony... in your gut. 

Over 70% of your immune system’s cells are connected to your digestive tract1. Healing your gut is the first and most important step to protecting yourself against viruses and harmful bacteria. 

Your intestines are home to roughly 10x more microorganisms than human cells in your entire body2. When balanced, your intestinal microflora (your gut) fights off harmful bacteria that cause illness. Daily supplementation with vitamins, minerals and probiotics is a great immunity-boosting tool!