Definition: "An ergogenic aid is any substance or phenomenon that enhances performance "
Vitamin D as a painkiller
If you suffer from chronic pain and there is little vitamin D in your blood, vitamin D supplementation may reduce your pain complaints. Supplementation will also improve your sleep and your quality of life.
Some veterans were deficient in vitamin D. They received a weekly supplement with 50,000 IU vitamin D2 for 3 months. Other veterans were insufficient. They received a daily supplement with 1,500 IU vitamin D3.
There was no placebo group.
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"A randomized controlled clinical trial with different supplementation schedules would provide better understanding of the effects and limitations of vitamin D supplementation in this population and reveal its possible underlying mechanisms."