correlational
Analysis v1
Strong Support
People aged 50 to 74 who have a little more vitamin D in their blood before getting the flu shot tend to have a slightly stronger immune cell response to the vaccine a few weeks later — but the connection is very small.
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0
Evidence from Studies
Supporting (1)
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Community contributions welcome
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Vitamin D, leptin and impact on immune response to seasonal influenza A/H1N1 vaccine in older persons
Cross-Sectional Study
Human
2016 Mar 3The study found that people with higher vitamin D levels before getting the flu shot had a slightly stronger immune cell response to the flu virus a few months later, which is exactly what the claim says.
Contradicting (0)
0
Community contributions welcome
No contradicting evidence found
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.