preparations

Health & Medicine

Vitamin D preparations: Öko-Test sharply criticizes dietary supplements

Willy Lewis, M.D. - January 2, 2025

Health & Medicine

Vitamin D preparations: Öko-Test makes a devastating verdict on dietary supplements

Willy Lewis, M.D. - December 27, 2024

Health & Medicine

Vitamin B12 preparations at Öko-Test: Most expensive preparation “insufficient”

Willy Lewis, M.D. - March 24, 2023

Health & Medicine

Vitamin B12 preparations at Öko-Test: How good are Doppelherz, Dr. Jacob’s, Vitamaze and Co.?

Willy Lewis, M.D. - January 26, 2023

Health & Medicine

Iron and iron deficiency: symptoms, diet tips and preparations

Willy Lewis, M.D. - January 17, 2022

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