Yes, it’s known as ‘going ouside and getting some sun’. This study perhaps should have been done in some less sun-intensive place like Scandinavia or Canada.
Although maybe White people in Australia avoid the sun? I know they sell both heavy-duty sunscreen and swim-gear that covers a lot of the body in Australia.
There’s some evidence that exposure to sunlight is correlated with lower risk of serious cardiovascular events - but that many of the presumed benefits may be independent of vitamin D levels.
This study looked at monthly high dosage vitamin D supplementation in older adults and the results were generally unimpressive.
Solar exposure is nifty in some respects, but in excess leads to higher risk of skin cancers. Even if you avoid those malignancies you wind up with bad-looking sun-damaged skin.
People living anywhere north of Boston don’t make vitamin D from sun exposure from November to March, so you don’t even need to leave the US.