What you're trying to do is use a fallacy, specifically, bad company fallacy. Is it just because I hadn't mentioned that they need to be good quality supplements, and that there aren't areas where sunlight is easily attainable, especially in the north of some countries?
Discussion
You’re saying I’m using a guilt by association fallacy?
Regardless of quality or region, I believe Vit D supplements are extremely rarely justifiable because of the biological downsides I shared.