Regarding d 3 supplement. In arteies!

No

No it doesn't but vit D shouldn't be taken without regular check ups and follow ups

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Taking vitamin D3 60,000 IU once weekly for 6 months is a commonly used and generally safe regimen, especially when treating deficiency. An increase from 19 to 28 ng/mL shows improvement, but this level is still insufficient to borderline low, which is why supplementation was continued. arterial calcification does not occur from vitamin D alone at this dosing schedule. Such calcification is associated with very high, prolonged vitamin D levels causing hypercalcemia, usually from daily high-dose use for months or years, not weekly dosing under medical guidance. If vitamin D is taken without excess calcium and blood calcium levels remain normal, the risk is extremely low. to be safe, you can check serum calcium, phosphorus, and repeat vitamin D levels after 8–12 weeks. Once vitamin D reaches 30–50 ng/mL, switching to a maintenance dose (1,000–2,000 IU daily or 60,000 IU monthly) is usually advised.