Vitamin C Therapy for Wound Healing After Amputation

Mechanism of Action and Benefits

Vitamin C is an essential cofactor/cosubstrate for collagen synthesis, which is crucial for wound healing after amputation 1
It functions as a potent water-soluble antioxidant that scavenges free radicals, mitigates oxidative stress, and recycles other antioxidants 2
Vitamin C protects the endothelium by promoting collagen synthesis and maintaining endothelial vasodilation and barrier function, which is critical during wound healing 1
It can limit inflammatory response and ischemia-reperfusion injury, which are common challenges in amputation wounds 1

The dosage of 1000 mg three times daily (3 g/day) aligns with clinical guideline recommendations for repletion during critical illness and inflammatory states 3, 4
During critical illness or after major surgery (like amputation), high vitamin C doses (2-3 g/day) are needed to restore plasma concentrations to normal levels 2
Sustained therapy is necessary to prevent recurrence of hypovitaminosis, which could impair wound healing 2
IV administration may be preferred initially if gut function is impaired, but oral administration at 1000 mg TID is appropriate once enteral intake is established 4

Vitamin C plasma levels decline rapidly with inflammation, making patients with surgical wounds at risk for functional deficiency despite normal intake 3
Vitamin C should be avoided in patients with hemochromatosis or iron overload conditions, as it can enhance iron absorption 5

Clinical monitoring of wound healing progress is more practical than measuring plasma vitamin C levels, which are difficult to interpret during inflammatory states 6
Treatment typically continues throughout the acute healing phase (approximately 2-4 weeks) or until adequate wound healing is achieved 4

Oral vitamin C absorption may be limited due to saturable intestinal transporters, particularly at high doses 2
Dividing the total daily dose (3 g) into three separate doses (1000 mg TID) helps maximize absorption 4
Very high doses of vitamin C (>10 g/day) may cause gastrointestinal side effects such as diarrhea and abdominal discomfort 3
Patients with renal impairment should be monitored as high doses of vitamin C can increase oxalate excretion 4