"report" can sound like it promises hard numbers and original data. we want to be upfront: phasebloom has not conducted a clinical study or population survey of women's hormone health. what follows is a plain-language summary of the kind of general, widely accepted information available from established health bodies such as the nhs and the who, alongside an honest account of where the evidence gets thinner.
what is generally well established
- the menstrual cycle is driven by a changing pattern of hormones, principally oestrogen, progesterone, follicle-stimulating hormone and luteinising hormone.
- cycle length varies between individuals and is commonly understood to range from around 21 to 40 days, with some natural variation from cycle to cycle.
- hormone levels change across the follicular phase, ovulation and the luteal phase, which is why symptoms such as energy, mood and appetite can shift throughout the month.
- factors such as stress, sleep, body weight, certain medical conditions and medications can all influence hormone balance.
- hormonal changes continue across life stages, including puberty, pregnancy, postpartum and the menopause transition.
these points are broadly consistent across nhs guidance and international health literature, which is why we feel comfortable stating them in general terms.
where the evidence is less settled
much of what is discussed around "hormone health" online, including specific percentages of women experiencing particular symptoms, or claims about how quickly a food or supplement changes hormone levels, is far less settled than it may appear. individual studies often use small samples, different measurement methods, or different populations, which makes broad statistics difficult to state with confidence.
we would rather leave a gap in this report than fill it with a number we cannot stand behind.
why we're telling you this
at phasebloom, we believe informed decisions begin with accurate information. it would be easy to present this page as if we had run a large survey of our own, but that would not be honest, and it could mislead people who rely on this information, including journalists or researchers who might cite it.
an evolving page
this report will keep evolving. as credible, well-conducted research becomes available, and as major public health bodies publish updated guidance, we will reflect those changes here, always distinguishing between well-established general facts and areas that are still being studied.
where to go next
for a closer look at the biology behind these hormones, see our glossary and individual hormone guides. for the evidence specifically relevant to seed cycling, our complete guide to seed cycling summarises current nutrient research honestly.