Vitamin C for Fracture Healing
Vitamin C supplementation does not improve fracture healing outcomes or functional recovery in healthy adults with fractures, and routine supplementation specifically for bone healing is not recommended based on the highest quality evidence. 1
Evidence Against Routine Vitamin C for Fracture Healing
The most definitive evidence comes from a 2014 double-blind randomized controlled trial of 336 patients with distal radius fractures, which found:
- No significant difference in functional outcomes (DASH scores) at 6 weeks or 1 year between vitamin C (500 mg daily for 50 days) and placebo 1
- No difference in time to fracture healing between groups 1
- Paradoxically worse outcomes in some subgroups: patients with nondisplaced fractures receiving vitamin C had greater wrist flexion deficits, pinch strength deficits, and higher CRPS rates at 6 weeks 1
- Higher complication rates and pain at 26 weeks in displaced fractures treated with vitamin C 1
This high-quality study directly contradicts the theoretical benefits and provides Level II therapeutic evidence against vitamin C supplementation for fracture healing 1.
Potential Role in CRPS Prevention (Not Fracture Healing)
While vitamin C does not accelerate bone healing, there is separate evidence for preventing Complex Regional Pain Syndrome (CRPS):
- 500 mg daily for 50 days reduced CRPS prevalence from 10.1% to 2.4% after wrist fractures in a 2007 multicenter trial (relative risk 0.17-0.41 depending on dose) 2
- This benefit is specifically for CRPS prevention, not bone healing acceleration 2, 3
- The effect was most pronounced in elderly women 2
Mechanistic Studies vs. Clinical Reality
Despite promising preclinical data showing vitamin C may enhance collagen synthesis and reduce oxidative stress in animal models 4, 5, these laboratory findings have not translated to clinical benefit in human fracture healing 1.
The systematic reviews acknowledge this disconnect: while animal studies show accelerated bone formation, human studies fail to demonstrate improved healing outcomes 5.
Clinical Recommendation
For a healthy adult with a fracture:
- Do not prescribe vitamin C specifically to accelerate bone healing – the evidence shows no benefit and potential harm 1
- Consider 500 mg daily for 50 days only if preventing CRPS in high-risk patients (elderly women, wrist fractures, early cast-related complaints) 2, 3
- Ensure adequate baseline nutrition through dietary sources (75-90 mg daily for general health) 6
- Focus on evidence-based fracture management rather than vitamin C supplementation 1
Important Caveats
- The FDA-approved vitamin C formulations are indicated for scurvy treatment, not fracture healing 7
- Vitamin C supplementation carries minimal risk in patients with normal renal function 7
- Patients with renal impairment face increased risk of oxalate nephropathy with high-dose vitamin C 7
- Smokers have increased oxidative stress and may benefit from an additional 35 mg daily for general health (not fracture-specific) 6