As new variants of COVID emerge—and as The Centers for Disease Control admits that vaccinations don’t guarantee protection—the importance of maintaining an optimal immune system is more critical than ever.

Fortunately a number of studies have examined which nutrients specifically help in tha COVID battle—and many of these studies have been published during the past year.

In this article we will provide a list of these key nutrients, along with links to the supporting research. We’ll also provide a list of the related OHS products. Use this information to start improving your own immune system, or to further your own research!

Of all immune-building nutrients, research on Vitamin D has been most prolific during the COVID pandemic. Studies in the U.S. found people with higher Vitamin D levels are less likely to contract COVID, and more likely to survive it if they do contract it. Meanwhile, Spanish research found 80% of COVID patients were low on Vitamin D, while a French study found elderly patients were more likely to survive COVID if they’re taking a Vitamin D supplement. Read all the Vitamin D studies we’ve covered here.

Nutrition experts say, “Most of your immune system originates from the gut”—and relative to COVID the research appears to coroborate this. A study from Mexico City found probiotic supplementing lowered the remission rates of COVID patients. Meanwhile, a study from Hong Kong found the quality of each patient’s gut bacteria affected how severely the disease affected them. 

A study from the Netherlands found that COVID-19 patients who have low Vitamin K status tend to have worse outcomes. Meanwhile, in New Zealand, early research from April 2020 found such a high rate of Vitamin K deficiency among COVID patients that they followed-up in 2021 with a hypothesis study. Read about both of those two studies here.

“DMB” is an accronym for the immune nutrients Vitamin D, Magnesium and Vitamin B12. Vitamin D has been covered extensively in other studies; however, medical researchers from Singapore General Hospital found that a combination of the three nutrients given via supplements reduced the progression of COVID-19 into the severe or fatal stages. Read the research here.

In the U.S. there is little mention of Vitamin C in the battle against COVID—out of fear of running afoul of government guidelines. In Asian countries, however, there is “expert consensus” in using high doses of intravenous Vitamin C for treatment. In addition, health practitioners are free to recommend Vitamin C supplementing for prevention without breaking the law. Read details here.

In late 2020 scientists in Sweden conducted an in vitro study providing the first evidence that nitric oxide prevents replication of the SARS-CoV-2 virus that causes COVID-19. Researchers were so impressed with their findings they wrote, “To our knowledge, nitric oxide is the only substance shown so far to have a direct effect on SARS-CoV-2.”

Nitric Oxide – Boosting Products

Exposure Protection Pak

Optimal Opti-Nitric

Optimal B.F.F. 

NOS Performance Pak

If you’re overweight one powerful “nutrient” you can provide your body is weight loss. Excess weight was observed to be a risk factor from the beginning of COVID. Then a more specific meta-analysis, published August 2020, found that obese people who contracted COVID-19 were 113% more likely to be hospitalized. Meanwhile, a report published February 2021 found countries with higher overweight populations had higher COVID deaths. Details here.

In April 2020 the British Medical Journal published a study entitled Nutrition, Immunity and COVID-19. In this study the researchers recommended the following nutrients: Vitamin A, all B vitamins, Vitamin C, Vitamin D, Vitamin E, Zinc, Copper, Selenium, Iron and probiotics. The Centers for Disease Control in the U.S. publishes a similar list of nutrients for immune support. Included in this is protection from viruses; however, they do not mention the “COVID-19” virus specifically.

Multi-Vitamin/Mineral Products

Exposure Protection Pak

Whole Food Vitamin/Mineral

Natural Z Pak


Optimal Natural Z Pak - immune boost