Can red light therapy affect blood pressure?

Question

Is there evidence suggesting RLT causes hypotension or hypertension in users?

Nancy Moore · Answer

Current research suggests that red light therapy generally has a neutral to beneficial effect on blood pressure, rather than causing harmful fluctuations. The primary physiological effect of RLT is the release of nitric oxide (NO) from mitochondria and endothelial cells. Nitric oxide is a potent vasodilator, meaning it relaxes blood vessels, which can lead to a temporary, mild reduction in blood pressure and improved circulation. This mechanism is actually leveraged therapeutically to help manage hypertension and improve cardiovascular health.

Studies conducted in recent years indicate that regular RLT can improve endothelial function, potentially aiding in the long-term regulation of blood pressure. There is no substantial evidence to suggest that RLT causes dangerous hypotension (low blood pressure) in healthy individuals. However, individuals who already suffer from severe hypotension or who are on strong vasodilating medications should monitor their response, as the additive effect could theoretically cause lightheadedness upon standing (orthostatic hypotension) immediately after a session, though this is rare.

Conversely, RLT does not cause hypertension. The relaxation response induced by the therapy often lowers stress hormones like cortisol, which can further support healthy blood pressure levels. While the acute drop in BP is usually minor and transient, users with unstable cardiovascular conditions should consult their cardiologist before starting regular full-body sessions, simply as a precautionary measure to ensure their specific medication regimen doesn't interact unexpectedly with the vasodilatory effects of NO release. Overall, RLT is viewed as cardiovascular-safe and potentially supportive.

Can red light therapy affect blood pressure?

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