| Date | Event | Description |
|---|---|---|
| 18 January 2011 | Amended | External source of support added. |
| 7 September 2010 | New citation required but conclusions have not changed | Review expanded to include postpartum supplementation; SOF table added. |
| 7 September 2010 | New search has been performed | Updated, with GRADE Summary of Findings table. |
| 14 May 2008 | Amended | Converted to new review format. |
| 14 May 2008 | New search has been performed | Update of review. |
| 11 January 2008 | New citation required and conclusions have changed | Substantive amendment |
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