Perimenopause doesn't arrive all at once, it unfolds gradually, often starting in your late 30s or 40s with subtle shifts in mood, sleep, energy, and cycle regularity. Because hormones don't function in isolation, they respond to light, stress, temperature, and environmental changes. That's why seasonal shifts can amplify perimenopausal symptoms. During this transitional phase, targeted supplements like magnesium, vitamin D, B-complex, and adaptogens may help support your body as it adapts. The key is flexibility, not a one-size-fits-all approach.