How long does increased NK cell activity last after forest sessions?

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Increased NK cell activity lasts up to 30 days after forest bathing sessions
Increased activity in Natural Killer (NK) cells after a forest bathing session can last for up to 30 days. The reported duration refers to the period following the session, not just during the time spent in nature.
NK cell activity persistence after a session
The key finding is that NK cell activity does not fade immediately after the forest bathing session ends. Instead, the increased activity persists for a prolonged window, lasting up to 30 days.
Timeframe measured from the forest bathing session
The duration is described as lasting “up to 30 days after a session.” That phrasing places the timeframe clearly in the post-session period rather than an ongoing effect without limit.
What the effect is linked to in the study description
The discussion connects forest bathing to changes in NK cells and related anti-protein levels such as perforin, GRN, and GrA/B. The NK cell activity increase is presented as part of this broader immune-related effect seen after spending time in nature.
The reported duration is the main takeaway
While the overall framing also mentions immune strengthening and potential cancer-cell identification and eradication roles of NK cells, the specific question here centres on how long the increased NK activity lasts. The stated answer is that it can last for up to 30 days after a session.

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How long does increased NK cell activity last after forest sessions?

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