Blood can be thickened by consuming more vitamin K, which helps blood to clot. Vitamin K can be found in foods such as leafy greens, vegetables like cauliflower and cabbage, and in fish, liver, meat and eggs. Although rare, vitamin K deficiency makes it easier for people to bleed and bruise.
According to the National Institute for Health's Medicine Plus Encyclopedia, the average adult requires at least 90 micrograms per day of Vitamin K.
Vitamin K1 is available as a supplement for vitamin K, which can be helpful to those who do not consume enough of it naturally. Vitamin K deficiencies are more common in newborn babies, and individuals who take blood thinners.