Hormone Health Hub: Expert Insights on Testing, Balance & Better Living — vitamin D deficiency symptoms

Did you know that low vitamin D could be disrupting your sleep? Research shows that vitamin D plays a key role in serotonin and melatonin production — the hormones that regulate your sleep-wake cycle. Dr. Kate Placzek explores the science behind the vitamin D–sleep connection, what else low vitamin D affects, and how to find out if deficiency is at the root of your sleep problems.

Thinning hair is more than a cosmetic concern — it is often a signal of something happening internally. From stress and cortisol to menopause, thyroid dysfunction, PCOS and nutritional deficiencies, hormones play a central role in hair health. Dr. Kate Placzek breaks down the science behind hormonal hair loss and what you can do about it.

Had your vitamin D tested and left confused by the result? You are not alone. Different agencies have different opinions on what counts as deficient, sufficient or optimal — and the gap between “normal” and “optimal” matters more than most people realise. Dr. Jillian Harrington breaks down the reference ranges, explains what your result actually means, and outlines how to work towards the level that is right for your health.

Vitamin D is not just a vitamin — it is a steroid hormone that plays a critical role in fertility, conception, placental development and fetal health. From improving ovulation in women with PCOS to supporting sperm motility in men, adequate vitamin D levels matter at every stage of the journey to parenthood. Discover why testing before and during pregnancy is increasingly recommended.