Jarrow Formulas believes smarter formulas — not bigger dosages — make the difference, formulating every supplement with rigorously tested, superior-quality ingredients selected for their real biological value. Working with renowned researchers worldwide, Jarrow uses bioavailable ingredient forms like MK-7 vitamin K2, methylated B vitamins and clinically studied probiotic strains that outperform generic alternatives. The result is a comprehensive line of science-driven supplements trusted by health professionals and knowledgeable consumers for over 40 years.