★ "What Worked For Me" Outcome Report @ZepboundLifter_NC • 45-59F • 112mcg Levothyroxine / 200mc • Week 20

▲ 41 Helpful • 2 Peer Replies

4-Hour Iron Separation + Selenium at Lunch (20 wks update): I'm a 52-year-old woman with Hashimoto's (TPO antibodies 380 IU/mL) taking 112mcg levothyroxine — what worked for others here?

I'm a 52-year-old woman with Hashimoto's (TPO antibodies 380 IU/mL) taking 112mcg levothyroxine. My TSH was stuck at 4.2-4.6 mIU/L despite dose increases until I fixed my supplement timing. Old protocol: levothyroxine 6am, iron bisglycinate 25mg + calcium citrate 500mg + vitamin D3 2000 IU all at 8am breakfast. New protocol: levothyroxine 6am, selenium 200mcg at noon lunch, iron + calcium + D3 at 6pm dinner (4+ hours later). TSH dropped to 2.1 mIU/L in 8 weeks, energy improved significantly. Ferritin rose from 22 to 48 ng/mL (I was anemic). Key lesson: iron and calcium are potent chelators—4-hour separation is non-negotiable.

⚕ Pinned FDA / NIH / PubMed Clinical Context • Karim El-Sayed — Literature & Label Auditor

FDA DailyMed labels for levothyroxine explicitly list iron and calcium as requiring 4-hour separation due to chelation reducing absorption by 40-60%. NIH ODS data confirm selenium (as selenomethionine) supports thyroid peroxidase enzyme function; 200mcg daily is safe upper intake for Hashimoto's patients.

Connected Clinical Guides: Condition: Hypothyroidism Condition: Hashimotos Thyroiditis Rx: Levothyroxine Rx: Liothyronine Supplement: Selenium Supplement: Iron Bisglycinate

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Verified Peer Replies (2)

@ShenandoahTrail_VA • Age 45-59 • Week 28 • Hashimoto's Protocol

This matches my experience exactly. I was taking iron at breakfast (90 minutes after levo) and my TSH wouldn't budge below 3.8. Moved iron to dinner, TSH hit 1.9 in 6 weeks. Also: make sure your iron is bisglycinate or ferrous sulfate—gluconate didn't absorb well for me.

@DriftlessAngler_WI • Verified Cohort Member • Week 16

Excellent protocol documentation. The 4-hour rule for iron/calcium is based on intestinal transit time and competitive binding at divalent metal transporters. Your ferritin rise (22→48 ng/mL) confirms improved iron absorption. For Hashimoto's patients, selenium 200mcg daily can reduce TPO antibodies by 20-40% over 6-12 months per multiple RCTs in the European Thyroid Journal.