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Why not periodically check blood levels and adjust the dosage, instead of low-balling. Low D levels are quite detrimental to health and longevity.

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This isn't something a regular person can easily decide using test results. Because vitamin D accretes over time, it's possible to overshoot.

A possible scenario: you get a test, take the supplement, take another test, see no difference, take a bigger dose, and the test after that shows the effect of the first dose. Then you decide to keep the bigger dose even though it's unnecessary.

The moderate dosages are safe according to most studies. However, I agree with what dragonwriter below wrote: people who think they need the bigger dosages better consult a doctor before making a decision.

Not everyone has the money to pay for $200 blood test every couple of months.

You can get blood tests for $50 (and indeed <$40 with sales/discounts) around much of the world, e.g. from OmegaQuant. Once every 6 months instead of once every 2 months is fine for most when doing initial calibration.

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