SUPPLEMENTS / SUPPLEMENT LIST / DR. WILLIAM LI

Dr William Li’s Supplement List in 2026

RT
By Routines Team Independent research · Sources cited
UPDATED JUN 2026 3 MIN READ3 SOURCES CITED
THE STACK — AT A GLANCE What he takes every day
3 ITEMS
Omega-3 Fatty Acids Daily, with breakfastAmazon →
Vitamin D3 Daily; test levels 2x/yearAmazon →
Probiotics Daily, in the morningAmazon →
Affiliate disclosure: we may earn a commission, at no cost to you. Doses vary by product; Dr. Li frames supplements as insurance around a food-first approach.

Backed by Science, Selected With Care

Dr. William Li, a physician and scientist, has reshaped our understanding of food and its impact on health. His supplement plan aligns with his belief that food can be like medicine. This guide covers his daily Supplement List, which help support key body functions.

Top 3 Supplements Dr William Li Uses

Omega-3 Fatty Acids: Good for the heart and brain, Omega-3s help reduce inflammation and keep your blood flowing well, which is important for cell function. Dr. Li suggests using high-quality fish oil that is purified to avoid any impurities.

Vitamin D3: This vitamin is important for your immune system. It helps your immune cells and controls many genes. Dr. Li says to check your Vitamin D levels twice a year to keep them right and stop diseases.

Probiotics: These are important for a healthy gut and immune system. Dr. Li recommends specific strains, such as Lactobacillus reuteri, to support digestion and oral health, which can help reduce inflammation and improve overall well-being.

Omega-3 Fatty Acids

Every morning, Dr. William Li makes sure to take an Omega-3 fatty acid supplement. This way, he gets the essential fats he needs, no matter what he eats that day. [1]

  • Comprehensive Support: Omega-3s play a big role in his health routine. They help his heart, brain, and circulation while also reducing inflammation, protecting against long-term health issues and supporting a longer life.
  • Omega-3 sources: Dr. Li likes to get Omega-3s from fish, nuts, and seeds. But he knows that pills can help if someone doesn’t eat these foods often. 

Adding Omega-3s helps his body function well, keeps stem cells healthy, and aids in healing.

Vitamin D3

Dr. William Li adds Vitamin D3 to his morning routine because many people, like him, don’t get enough sun year-round. He takes a good Vitamin D3 pill each day to help keep his body running well. [2]

  • Comprehensive Support: Vitamin D3 helps your body absorb calcium and phosphorus, which are essential for strong bones and teeth. Dr. Li points out that it also boosts your immune system, allowing you to avoid infections and chronic illnesses. He especially suggests Vitamin D3 for those who live in northern areas or spend a lot of time indoors, where they don’t get enough sun.
  • Balanced Nutrition: While Dr. Li recommends getting vitamin D from foods like mushrooms and fortified items, he believes supplements are often a more reliable way to reach the right levels. 

He mentions that even cool ideas like putting sliced mushrooms in the sun might not give most people enough vitamin D. 

Probiotics

Dr. William Li takes a good probiotic every day because he knows how important a healthy gut is for overall well-being. He adds them to his morning routine to help with digestion and maintain his oral health, ensuring there are plenty of good bacteria in his body. [3]

  • Comprehensive Support: Probiotics are good for your gut. They help you digest food, soak up nutrients more easily, and boost your immune system. Dr. Li says some probiotics, like Lactobacillus reuteri, do more than help your gut. They can also help protect your teeth by reducing the bacteria that cause cavities.
  • Why Dr. Li Uses Probiotics: Dr. Li enjoys probiotics because they help keep our gut in check, which is crucial for our immune system, metabolism, and overall well-being. Foods like yogurt, kimchi, and sauerkraut are awesome sources of probiotics, but if you don’t eat them regularly, taking a daily supplement is an easy way to make sure you’re getting those good bacteria.

Like Dr. Li does, a probiotic supplement can help with digestion, boost your immune system, and maintain good dental health. It’s a good way to stay healthy over time.

References

  1. Swanson, D., Block, R., & Mousa, S. A. (2012). Omega-3 fatty acids EPA and DHA: health benefits throughout life. Advances in Nutrition, 3(1), 1–7. PubMed
  2. Martineau, A. R., Jolliffe, D. A., Hooper, R. L., Greenberg, L., Aloia, J. F., Bergman, P., ... & Camargo, C. A. (2017). Vitamin D supplementation to prevent acute respiratory tract infections: systematic review and meta-analysis of individual participant data. BMJ, 356, i6583. PubMed
  3. Ritchie, M. L., & Romanuk, T. N. (2012). A meta-analysis of probiotic efficacy for gastrointestinal diseases. PLoS ONE, 7(4), e34938. PubMed
★ THE MORNING NON-NEGOTIABLE DAILY, WITH BREAKFAST
Omega-3 Fatty Acids
He takes an omega-3 supplement every morning so he gets the essential fats regardless of what he eats that day. He credits omega-3s with supporting his heart, brain and circulation while reducing inflammation, and insists on a high-quality fish oil that's purified to remove impurities.
Get the exact one →high-purity fish oil
Vitamin D3
Vitamin D3 DAILY; TEST LEVELS 2X/YEAR
Added to his morning routine because most people, himself included, don't get enough sun year-round. It supports calcium absorption, bone strength and immune function, and he advises checking your vitamin D levels twice a year to keep them in range.
Probiotics
Probiotics DAILY, IN THE MORNING
A daily probiotic he takes for gut and oral health, aiding digestion and nutrient absorption. He points to specific strains like Lactobacillus reuteri, which can also help protect teeth by reducing the bacteria that cause cavities.

Dr. Li's plan starts from the belief that food can act like medicine, he gets omega-3s from fish, nuts and seeds and vitamin D from mushrooms and fortified foods, then uses supplements to reliably close the gaps when diet alone falls short.

The complete list

SUPPLEMENT DOSE WHY HE TAKES IT LINK
Omega-3 Fatty Acids Daily, with breakfast He takes an omega-3 supplement every morning so he gets the essential fats regardless of what he eats that day. He credits omega-3s with supporting his heart, brain and circulation while reducing inflammation, and insists on a high-quality fish oil that's purified to remove impurities.Buy →
Vitamin D3 Daily; test levels 2x/year Added to his morning routine because most people, himself included, don't get enough sun year-round. It supports calcium absorption, bone strength and immune function, and he advises checking your vitamin D levels twice a year to keep them in range.Buy →
Probiotics Daily, in the morning A daily probiotic he takes for gut and oral health, aiding digestion and nutrient absorption. He points to specific strains like Lactobacillus reuteri, which can also help protect teeth by reducing the bacteria that cause cavities.Buy →
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