Vitamin D, B12 & folate: labs and hair loss
D, B12, folate — what labs can and cannot explain about shedding or thinning.
Before every “hair vitamin,” how D, B12, and folate fit a sensible check-up with your doctor.
Insights
What might be behind your hair loss?
Worried about sudden shedding, gradual thinning, hormones, blood tests, or an irritated scalp? Start below, then search — we cover medicines, office procedures, and long-term hair support in plain language. This is education, not a substitute for an exam with your doctor.
Patient-first
Guided reading for hair shedding, thinning, blood markers, and treatment questions.
Evidence-aware
Educational content that stays medically serious without becoming cold or overwhelming.
Easy to navigate
Browse curated starting points, then narrow down by topic, hub, audience, or format.
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Start here
Choose the concern that feels closest to your experience, then narrow down with search when you want more detail.
- Go to guideI’m shedding suddenlyHeavy or diffuse shedding after stress, illness, or pregnancy — what that can mean.
- Go to guideMy hair is thinning graduallySlow thinning, part widening, or pattern change — how causes are sorted out.
- Go to guideI think hormones or blood tests may be involvedFerritin, thyroid, and other labs — when they help and when they don’t.
- Go to guideI’m comparing minoxidil routesTopical versus oral minoxidil — what’s shared, what differs, and why “stronger” isn’t the whole story.
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2 articles
Ferritin and hair loss: what your result means
One lab value for stored iron — helpful in context, not a full diagnosis of why hair is shedding.
Low ferritin can matter for shedding — not a DIY iron prescription. Basics before you supplement.