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The latest in research by Dr. Glenn Rothfeld.

My Supplement Shelf: Probiotics

My Supplement Shelf:  Probiotics  Probiotics are often discussed as if all probiotics were interchangeable—or as if swallowing a few billion “g... ... Read More

My Supplement Shelf: Probiotics

Glenn Rothfeld | September 03, 2026

My Supplement Shelf:  Probiotics  Probiotics are often discussed as if all probiotics were interchangeable—or as if swallowing a few billion “g...

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My Supplement Shelf: Vitamin K2

Glenn Rothfeld | June 30, 2026

My Supplement Shelf: Why I Take Vitamin K2  Vitamin K is in an odd position on the supplement shelf.  It’s essential, but largely ignored next to ...

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My Supplement Shelf: Vitamin D3

Glenn Rothfeld | May 20, 2026

At 75 years old, living with Parkinson’s Disease, I have become increasingly interested in therapies that support strength, mobility, cognition, im...

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