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Vitamin K cannot be produced physiologically by human cells but can be synthesized by the gut microbiota (vitamin K2 or menaquinone) ( Vitamin K deficiency is rare in adults, primarily due to malabsorption, total parenteral nutrition, or antibiotic use (which reduces gut bacteria production of vitamin K), a common issue in oncology wards

can be risk factors that increase with age, leading to higher susceptibility to adverse drug reactions [173]

However, as with any supplement, potential side effects and safety considerations exist, particularly for individuals with pre-existing health conditions

The ingredients in the 25% Vitamin C + Glutathione Clinical Serum are generally considered safe to use during pregnancy or while breastfeeding

Published preclinical protocols and community-derived references typically use about 250 mcg once or twice daily by subcutaneous injection