Telogen effluvium supplement protocol — iron, vitamin D, and what actually helps
Telogen effluvium (TE) is acute diffuse hair shedding triggered by a physiological stressor two to four months prior — an illness with high fever, childbirth, major surgery, severe weight loss, starting or stopping certain medications (oral contraceptive transitions, SSRIs, beta-blockers, retinoids, anticoagulants), or correctable nutritional deficiency. The hair-cycle reset itself is self-limiting in most cases — full recovery typically takes 6–12 months once the trigger has resolved. The supplement layer matters mainly through correctable deficiencies: ferritin, vitamin D, zinc, and thyroid status. Everything beyond those is supportive at best.
What actually has trial evidence
Iron — only when ferritin is low (test first)
Ferrous bisglycinate 25–50 mg elemental, on an empty stomach with vitamin C, every other day
Ferritin <30 ng/mL is associated with TE and other diffuse alopecias; the optimal hair-cycle ferritin target is debated, but most hair specialists aim for ferritin ≥50 ng/mL. Supplement only if ferritin is actually low — iron is hazardous in iron overload (hereditary hemochromatosis affects 1 in 200 people of Northern European ancestry). Bisglycinate is well-tolerated; alternate-day dosing improves absorption and reduces constipation. Take with vitamin C; separate from coffee, tea, calcium, and thyroid medication.
Vitamin D3 — only when 25-OH-D is low (test first)
2,000–4,000 IU/day to a 25-OH-D target of 30–50 ng/mL
Vitamin D deficiency is more prevalent in TE and FPHL cohorts than in matched controls, and several small trials have shown improvement in shedding when deficiency is corrected. Test 25-OH-D and supplement to target; megadose annual bolus regimens are not appropriate.
Zinc — only when serum zinc is low (test first)
Zinc bisglycinate or picolinate 15–22 mg elemental zinc/day with food
Frank zinc deficiency causes a characteristic alopecia and is overrepresented in some TE cohorts. Supplement only if documented deficiency. Long-term zinc supplementation without copper can produce copper deficiency — pair with 1–2 mg copper if zinc is continued more than 4–6 weeks.
Adequate protein intake (target 1.0–1.2 g/kg/day)
Diet first; whey or plant protein supplementation to gap-fill
Hair is largely keratin (a protein). Severe protein restriction and very-low-calorie dieting are well-documented TE triggers. Adequate protein intake is foundational. In users on calorie deficit (intentional weight loss, GLP-1 therapy), protect protein intake actively.
Marine collagen peptides (specific brands have trial evidence)
2.5–10 g/day specific marine collagen peptide preparations
Some small RCTs of specific marine collagen preparations show improved hair density and reduced shedding in women with self-reported thinning. Mechanism uncertain; effect likely modest. Generic collagen powder is unlikely to replicate trial-specific preparations' effects.
Specific hair-supplement combinations (Nutrafol-style multivitamin + adaptogen blends)
Per product instructions
Several proprietary hair-supplement combinations (Nutrafol, Viviscal) have small RCT signal in women with self-reported thinning, but trials are funded by manufacturers and effect sizes are modest. Reasonable as an adjunct if budget allows and underlying deficiencies are already addressed; not appropriate as a first-line replacement for proper work-up.
What to address first — the underlying drivers
TE almost always has a trigger; identifying and addressing it matters more than any supplement:
- Recent illness, COVID-19, surgery, hospitalisation — the 2–4 month delay is the classic TE pattern; usually self-limiting.
- Postpartum (3–6 months post-delivery) — physiological, common, recovers spontaneously typically within 6–12 months.
- Severe weight loss / restrictive dieting — protect calorie and protein intake actively.
- Medication change — review starts and stops in the past 4 months: oral contraceptive transitions, SSRIs/SNRIs, beta-blockers, retinoids, anticoagulants, statins, lithium, valproate, amphetamines, isotretinoin.
- Thyroid disease — test TSH and free T4 — both hyper- and hypo-thyroidism cause TE.
- Iron-deficient state — test ferritin and full iron studies — particularly in menstruating women.
- Severe stress (psychological) — yes, it's real and well-documented as a TE trigger.
- Acute weight loss with GLP-1 medications — increasingly common driver; protect protein and calorie intake.
What to skip
- Biotin (unless deficient) — supplementation has no demonstrated benefit in non-deficient TE patients and interferes with multiple lab assays (TSH, troponin, parathyroid). Stop biotin at least 72 hours before any blood test.
- "Hair, skin, and nails" megadose multivitamins with everything kitchen-sinked — usually deliver biotin, sometimes high-dose vitamin A (which itself can cause hair loss), and rarely have evidence beyond the iron/D/zinc components.
- High-dose vitamin A or retinol "for skin and hair" — paradoxically causes TE at higher chronic doses.
- Saw palmetto without androgenic alopecia evaluation — saw palmetto has some evidence in androgenetic alopecia (AGA) but not in TE; if the diagnosis is wrong, treatment will be wrong.
- DIY "scalp serums" with unstudied ingredient combinations — minoxidil 5% (topical) has the trial evidence in FPHL; not first-line in pure TE without overlapping pattern hair loss.
- Excessive zinc without copper — chronic high-dose zinc produces copper deficiency that itself causes neurological and haematological problems.
What to track
Repeat the "60-second hair count" weekly: count hairs lost in the morning shower or on the pillow. Photograph the part and crown in consistent lighting weekly. Track shedding count + scalp photos against the timeline. Most TE resolves 6–9 months after the trigger is removed and deficiencies are corrected. If shedding has not slowed at 6 months despite ferritin ≥50, 25-OH-D 30+, normal thyroid, and adequate nutrition, dermatology referral for biopsy or alternative diagnosis (FPHL, scarring alopecia) is reasonable.