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Don't really know why you haven't found the most obvious explanation for why you've gotten fewer colds.

Vitamin D has a direct effect on colds.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5949172/

Another study to back you up: https://pubmed.ncbi.nlm.nih.gov/16959053/

Ok, but you know what has a really really direct effect on colds?

I swear, it's like people don't understand why we measure R_t. propagation is sigmoidal phenomenon. A reduction in transmission by 10% can easily lead to a reduction in prevalence by nearly 100%.

Obviously thought about that but the intensity of the colds is way different.

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