Low iron levels can have a negative impact on hair growth. Iron is essential for the production of hemoglobin, which carries oxygen to the cells, including those in the hair follicles. When there is a deficiency of iron, the hair follicles may receive less oxygen, leading to weakened and thinning hair. Additionally, iron deficiency can disrupt the hair growth cycle, causing more hair to enter the resting phase (telogen) and shed prematurely. It's important to maintain sufficient iron levels through a balanced diet, supplements, and herbs to support healthy hair growth.