If I stop using the Diana Stalder Lightening or Whitening product for some period of time, will the effects of previous usage be undone, even if I do not go out in the sun?
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Limiting sun exposure will certainly help delay the reverse process. But like any other any topical skin whitening/lightening product, once you stop using it, your skin eventually reverts back to its natural color over a period of time.
Your skin will return to its normal melanin production level, once you stop using the product. Thus, sun exposure will play a major role in slowing or speeding up the reverse process.
To date there is no topical skin whitening product that produces permanent results.