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The menopausal transition often brings changes that can influence cardiovascular health. As women move through this phase, shifts in hormone levels may contribute to alterations in various cardiovascular risk factors.
Many women seek ways to support their well-being during this time. This article explores current insights into how red clover isoflavones might relate to multiple cardiovascular risk factors observed during the menopausal transition.
Understanding Cardiovascular Risk During Menopause
Cardiovascular health is a significant concern for women, particularly as they approach and navigate menopause. The decline in estrogen levels during this period is thought to play a role in changes to several indicators related to heart and blood vessel health. These changes can include alterations in cholesterol profiles, blood pressure, and blood vessel function.
It’s important for women in midlife to be aware of these potential shifts and to discuss them with their healthcare providers. Lifestyle factors, such as diet and exercise, are foundational for maintaining cardiovascular well-being at any age, and especially during this transition.
Red Clover Isoflavones: A Closer Look
Red clover (Trifolium pratense) is a legume that contains a group of plant compounds known as isoflavones. These isoflavones, including formononetin, biochanin A, daidzein, and genistein, are phytoestrogens, meaning they have a chemical structure similar to estrogen and can interact with estrogen receptors in the body.
The interest in red clover isoflavones stems from their potential to interact with various physiological processes. Given the role of estrogen in cardiovascular health, researchers have investigated whether these plant compounds might offer support during periods of hormonal change, such as menopause.
Red Clover Isoflavones and Blood Lipids in Menopausal Transition
One area of focus for red clover isoflavones research has been their potential influence on blood lipid profiles. Cholesterol and triglycerides are key components of cardiovascular risk assessment. The SWAN cohort followed these markers through the transition itself and found that only total cholesterol, LDL (‘bad’) cholesterol and apolipoprotein B rose sharply in the year either side of the final menstrual period; the other risk factors it tracked followed a pattern of ordinary chronological aging instead [1]. HDL (‘good’) cholesterol is the marker most often described backwards: measured HDL cholesterol rose across the transition, while HDL particles grew smaller and each particle became less efficient at accepting cholesterol [2]. The adverse shift is in how HDL behaves, not in how much of it is present.
While studies have explored the impact of red clover isoflavones on lipid profiles in menopausal women, the findings have been varied. Two meta-analyses of randomized trials agree on one point and part company on the rest. A 2018 pooled analysis of twelve trials in 1,284 peri- and postmenopausal women reported significant falls in total cholesterol, LDL cholesterol and triglycerides together with a small rise in HDL cholesterol [3]. A 2020 analysis restricted to one standardized extract reproduced the total-cholesterol reduction, but there the changes in LDL cholesterol, triglycerides and HDL cholesterol did not reach statistical significance [4]. Both reported substantial heterogeneity between the trials they pooled. This variability may be due to differences in study design, duration, dosage of isoflavones, and the specific characteristics of the women participating in the research. Therefore, the evidence regarding a consistent effect on blood lipids is not conclusive.
Exploring Blood Pressure and Vascular Function
Blood pressure regulation and the health of blood vessels are crucial for cardiovascular well-being. Hypertension (high blood pressure) is a major risk factor for heart disease and stroke. Vascular function, referring to how well blood vessels dilate and constrict, can also be affected by menopausal changes.
Research into red clover isoflavones and their potential effects on blood pressure and vascular function points in two different directions, and the two are worth keeping apart. On blood pressure the trials are consistent, but consistently negative: a randomized crossover trial in 80 men and postmenopausal women taking 80 mg of isoflavones daily found no effect on 24-hour ambulatory blood pressure [5], and a 12-week trial in 60 menopausal women likewise recorded no change in blood pressure [6]. On arterial stiffness the same kind of trial found something measurable: 80 mg of red clover isoflavones a day raised systemic arterial compliance, an index of how elastic the large arteries are, by 23 percent against placebo, while leaving plasma lipids unchanged [7], and the crossover trial showed the same direction as reduced arterial stiffness and lower total peripheral resistance, with the effect appearing to rest on the formononetin fraction [5]. A 2006 review of the clinical literature, written before the meta-analyses above, drew the same split: it judged the evidence then available insufficient to support an LDL-lowering effect, but considered the evidence for improved arterial compliance suggestive [8]. These are small, short trials measuring a surrogate marker rather than heart attacks or strokes, so further research with larger populations and longer durations is still needed before any of this is settled.
Overall Cardiovascular Risk Factors and Red Clover
When considering multiple cardiovascular risk factors together, the picture for red clover isoflavones becomes complex. Cardiovascular health involves a network of interconnected systems, and influencing one factor may not automatically translate to a broad impact across all risk markers.
The current body of evidence offers moderate insights into the relationship between red clover isoflavones and multiple cardiovascular risk factors in menopausal women. While some individual studies have pointed towards promising directions for specific markers, the overall consensus for a consistent, widespread benefit across all major cardiovascular risk factors is not yet firmly established. Women interested in supporting their cardiovascular health should prioritize established lifestyle recommendations and consult with their healthcare provider.
References
- Are changes in cardiovascular disease risk factors in midlife women due to chronological aging or to the menopausal transition?. Journal of the American College of Cardiology, 2009
- HDL (High-Density Lipoprotein) Subclasses, Lipid Content, and Function Trajectories Across the Menopause Transition: SWAN-HDL Study. Arteriosclerosis, thrombosis, and vascular biology, 2021
- Effects of red clover on perimenopausal and postmenopausal women’s blood lipid profile: A meta-analysis. Climacteric : the journal of the International Menopause Society, 2018
- Effects of red clover (Trifolium pratense) isoflavones on the lipid profile of perimenopausal and postmenopausal women-A systematic review and meta-analysis. Maturitas, 2020
- Isoflavones reduce arterial stiffness: a placebo-controlled study in men and postmenopausal women. Arteriosclerosis, thrombosis, and vascular biology, 2003
- Intake of Novel Red Clover Supplementation for 12 Weeks Improves Bone Status in Healthy Menopausal Women. Evidence-based complementary and alternative medicine : eCAM, 2015
- Isoflavones from red clover improve systemic arterial compliance but not plasma lipids in menopausal women. The Journal of clinical endocrinology and metabolism, 1999
- Clinical studies of red clover (Trifolium pratense) dietary supplements in menopause: a literature review. Menopause (New York, N.Y.), 2006
These statements have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure, or prevent any disease. Content is for informational purposes only and is not medical advice; consult a qualified healthcare provider before starting any supplement. As an Amazon Associate we earn from qualifying purchases.
