Does melatonin raise blood pressure?
Melatonin is primarily known for its effects on sleep and circadian rhythm, but it is sometimes suspected of affecting blood pressure. Indeed, there is some concern as to whether the use of this hormone could increase blood pressure, especially in people taking medication for hypertension or who are already sensitive to blood pressure variations. Research on this subject is still limited and shows contradictory results. In this article, we will explore the various possible effects of melatonin on blood pressure, analyzing the results of available studies and taking into account individual factors.
1. Hypotensive effect
Although melatonin is primarily associated with sleep regulation, some researchers suggest that it may have a beneficial effect on blood pressure, especially at night. Indeed, in some individuals, particularly those suffering from nocturnal hypertension, melatonin may contribute to a slight drop in blood pressure. Nocturnal hypertension is a phenomenon where blood pressure remains high during the night, contrary to the natural drop that occurs in healthy individuals. This condition is often associated with an increased risk of cardiovascular disease, and it is therefore crucial to control these fluctuations.
Melatonin, by regulating the sleep cycle, could play a role in normalizing these nocturnal blood pressure variations. Several studies have shown that melatonin can promote a slight but significant reduction in blood pressure during the night, when most individuals experience a natural drop in blood pressure. This effect could be particularly beneficial for people with mild to moderate hypertension, but it remains to be confirmed whether this hypotensive effect is powerful enough to replace conventional medical treatments.
This hypotensive effect is often observed in controlled studies that measure blood pressure in people who have taken melatonin before sleeping. However, it is important to note that the impact of melatonin on blood pressure appears to vary depending on individuals and the doses used.
2. Individual sensitivity and risks of blood pressure variation
As with many side effects, the impact of melatonin on blood pressure can be subjective and vary from person to person. In some individuals, particularly those with increased sensitivity to hormonal fluctuations, taking melatonin can lead to minor variations in blood pressure, including a temporary increase.
This phenomenon is generally associated with excessively high doses of melatonin or prolonged use. In case of overdose, the body can react unpredictably, which could lead to a slight increase in blood pressure, although this effect is rarely reported in available studies. It is therefore important to respect the recommended doses, generally between 1 mg and 3 mg per night, to avoid these undesirable effects.
People with a history of hypertension or who are taking medication to regulate their blood pressure should be particularly vigilant when considering using melatonin. If you have concerns about the potential impact of melatonin on your blood pressure, it is essential to consult a healthcare professional before starting treatment, even at a low dose.
3. Long-term studies
While several studies have explored the impact of melatonin on blood pressure in the short term, there is still little research on the long-term effects of melatonin use, particularly concerning cardiovascular health. In the absence of definitive data, it is difficult to draw solid conclusions about the role of melatonin in the long-term evolution of hypertension.
Most current studies focus on the immediate effects of melatonin on blood pressure, but they do not yet allow for an assessment of its long-term impact. One of the reasons for this research gap is that melatonin is generally used to treat sleep disorders, which means that its direct effect on blood pressure is sometimes secondary in studies. Available results suggest that melatonin could have beneficial effects on blood pressure regulation at night, but it remains essential to conduct long-term studies to confirm these effects, particularly in individuals suffering from hypertension or with a history of heart problems.
Current research suggests that melatonin could have a hypotensive effect in some individuals, particularly those suffering from nocturnal hypertension. However, the impact on blood pressure is modest and varies considerably depending on individuals and the doses administered. Melatonin appears more likely to slightly reduce blood pressure in people with higher blood pressure levels at night, but additional long-term research is needed to better understand its effects on cardiovascular health.
For those who suffer from hypertension or who take medication to control their blood pressure, it is important to consult a healthcare professional before starting melatonin treatment. Indeed, high doses or prolonged use of this hormone can, in rare cases, lead to minor variations in blood pressure. As always, it is essential to follow the recommended doses and maintain a balanced lifestyle to ensure optimal cardiovascular health.
Also explore:
For its beneficial role: Is melatonin good for the heart?
For potential side effects: What are the side effects of melatonin?
References:
- American Heart Association (AHA): heart.org
- Hypertension Research Journal - Melatonin and blood pressure: Studies on hypotensive effects.
