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What Ferritin Levels Mean for Your Hair Optimal ferritin levels for healthy hair growth typically range between 40-70 ng/mL, though research suggests levels above 40 ng/mL are necessary to prevent hair loss [1]

[PubMed] [Google Scholar] 72.Sikiric P., Seiwerth S., Grabarevic Z., Rucman R., Petek M., Rotkvic I., Turkovic B., Jagic V., Mildner B., Duvnjak M., et al

Holding the B12 in your mouth for at least 90 seconds is good and the longer you can leave it in your mouth, the better for sublingual absorption (as opposed to gut absorption)

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