‘Father of Functional Medicine’ Reflects on Health and Longevity at 79
May 27, 2025
Supplements scattered on a table with garlic and herbs in the background | Source: Pexels
Supplements Can’t Boost Immunity, Says Functional Medicine Expert
Supplements like zinc, vitamin D, and cod liver oil are often promoted as immune system boosters—but that claim is misleading, according to Jeffrey Bland, a leading voice in functional medicine.
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Bland, known as the “father of functional medicine” and president of the Personalized Lifestyle Medicine Institute, says that while nutrients can support immune health in deficient individuals, they do not actively enhance immune function in the way vaccines do.
Colorful pills organized in a weekly pill box on a purple background | Source: Pexels
“I’ve heard, ‘I can boost my immune system if I take a lot of vitamins.’ … [But] those nutrients don’t boost the immune system,” Bland told CNBC Make It. “You’re not going to boost the immune system like you do with a vaccination.”
Instead, Bland encourages people to shift their focus toward immune system rejuvenation. Immune cells are replaced approximately every four months, and lifestyle choices can influence the quality of those new cells.
“The question I ask people is, ‘Do you want the cells that are replacing the ones today to be as good as, better than, or worse than the ones that you have [now]?’” he said.
Bland outlines five practices to help support this rejuvenation process:
Follow a Mediterranean diet, emphasizing plant-based foods, olive oil, and natural proteins.
Prioritize quality sleep, which he says is crucial for bodily restoration.
Engage in daily physical activity such as walking, dancing, or aerobic exercise.
Stay hydrated, with at least 25 to 30 ounces of water daily.
Maintain strong relationships, as emotional well-being also impacts immune function.
People sharing a fresh, colorful meal around a wooden table | Source: Pexels
“Those are some simple tips,” Bland said. “[It] can make significant differences in your immune capability.”
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