Yes! The half-life of Vitamin D in the body is very long. Toxicity can build over many months of supplementation, which is why it's important to get a blood test after around 6 months of starting supplementation.
What's interesting: There doesn't seem to be toxicity associated with Vitamin D produced by sunlight. The body seems to have mechanisms that prevent overdose, even if you're constantly in the sun.
There was a lady on a reddit sub who claimed she is working in a hospital and having cases of people overdosed with vitamin D that causes calcium to build up in the blood vessels.
