Increased Vitamin D response if take cofactors, etc
Response by two groups taking 10,000 IU of Vitamin D (2017?)

| GrassrootsHealth | Cluster Headache | |
| Vitamin D level | 64 ng | 83 ng (24% higher) |
| Cofactors | unknown | Yes: Mg, Omega-3, Boron, etc |
| Number of tests | 1599 | 166 |
| Demographics | Caucasian | Caucasian |
Some people can get even higher response if:
Take same total amount weekly or every two weeks
Take topical form of Vitamin D
Take a non-oil based form of oral Vitamin D
Take a gut friendly form of oral vitamin D
- Poor guts need different forms of vitamin D has the following
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