What vitamin are you lacking if you bruise a lot?
Short answer: Easy bruising is commonly associated with vitamin C deficiency (ascorbic acid), which weakens blood vessel walls by impairing collagen formation. Vitamin K deficiency can also cause bruising by reducing blood clotting; both require clinical evaluation to determine the cause.
Explanation
Vitamin C is essential for hydroxylation of collagen, a key structural protein in blood vessel walls; deficiency (scurvy) leads to fragile capillaries and spontaneous bruising. Vitamin K is required for gamma-carboxylation of clotting factors II, VII, IX, and X, so low vitamin K (from poor intake, malabsorption, or antibiotics) or anticoagulant use prolongs bleeding and can present as easy bruising. Other non-vitamin causes include low platelets, liver disease, inherited bleeding disorders, medications (anticoagulants, antiplatelets, corticosteroids), and age-related thinning of the skin. Determining the cause typically involves a medical history, medication review, and basic labs (CBC, platelet count, PT/INR, aPTT) and targeted nutritional assessment.
Tips
- See a healthcare provider for evaluation if bruising is new, severe, or accompanied by other bleeding signs.
- Have basic blood tests (CBC, platelet count, PT/INR, aPTT) to assess clotting and platelet function.
- Improve dietary vitamin C (citrus fruits, strawberries, bell peppers, broccoli) and address malabsorption or poor intake.
- Review all medications and supplements with your clinician—anticoagulants and antiplatelets increase bruising risk.
- Do not start high-dose supplements without medical advice; treat underlying causes identified by testing.
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