Expert Q&A

Switching from Levothyroxine to ERFA (NDT) – Advice on sourcing in Europe/UK specifically for women over 40

Understanding the Switch from Levothyroxine to ERFA NDT

As women over 40, many of us battle hypothyroidism that worsens with perimenopause. Levothyroxine provides only T4, but our bodies often struggle with conversion to active T3 due to stress, inflammation, and estrogen shifts. ERFA, a form of natural desiccated thyroid (NDT), contains both T4 and T3 in a 4:1 ratio plus trace T2, T1, and iodine—closer to what our thyroid naturally produces. In my clinical experience and detailed in The CFP Weight Loss Method, this switch often unlocks stubborn weight, reduces brain fog, and improves energy when dosed correctly.

Typical starting conversion: 100mcg levothyroxine roughly equals 1 grain (60mg) ERFA, but individual needs vary 25-50% based on labs. Always work with a practitioner to monitor free T3, free T4, reverse T3, and TSH every 6-8 weeks initially.

Dosing and Monitoring for Women Over 40

Begin low and titrate slowly—start at ½ grain ERFA daily on an empty stomach, increasing by ½ grain every 10-14 days. Women in our 45-54 age group with joint pain and blood pressure concerns often stabilize between 1.5-2.5 grains. Pair this with my CFP approach: 40g protein at breakfast within 90 minutes of waking to stabilize cortisol and support metabolic flexibility.

Track symptoms beyond the scale—joint pain should ease within 4 weeks if inflammation drops. Combine with gentle movement like 20-minute daily walks; intense gym sessions often backfire when hormones are shifting.

Sourcing ERFA NDT Safely in the UK and Europe

ERFA is prescription-only. In the UK, private GPs or functional medicine doctors through platforms like The Thyroid UK or private clinics in London and Manchester can prescribe it. Expect £40-70 per 100-tablet supply. In Europe, Germany, Spain, and the Netherlands have more open-minded endocrinologists; some patients order via licensed pharmacies in Portugal after securing an EU prescription.

Avoid unregulated online sources—counterfeit risks are real. Reputable options include direct ERFA from Canadian pharmacies with valid prescription, or licensed EU compounding pharmacies. Insurance rarely covers NDT, so budget £25-45 monthly. Always verify batch numbers and require third-party testing for potency.

Integrating with CFP Weight Loss for Long-Term Success

Once optimized on ERFA, my method emphasizes simple habits over restrictive diets that failed you before. Focus on blood sugar balance with balanced plates—no complex meal plans needed. Many women lose 1-2lbs weekly while managing diabetes markers. Address insulin resistance common after 40 by eating within a 10-12 hour window, not intermittent fasting extremes that stress adrenals.

Results compound: better thyroid levels reduce joint pain, making movement sustainable. Within 90 days, most report improved confidence and energy. Consult your doctor before switching—never adjust alone.

💬 What the Community Says

Women in UK and European forums report mixed experiences switching to ERFA from levothyroxine. Many over-40 users praise improved energy, easier weight loss around the middle, and reduced brain fog compared to synthetic T4 alone, especially during perimenopause. Common dosing starts at 1 grain with careful lab monitoring every 6 weeks. Sourcing remains a major frustration—NHS GPs rarely prescribe NDT, pushing women toward private doctors costing £150+ per consultation. European members in Germany and Netherlands share success getting prescriptions locally, while UK users often mention ordering from Canada with a private script. A vocal minority warns about initial adjustment symptoms like heart palpitations if titrated too quickly. Insurance denial is a frequent complaint, with many paying out-of-pocket. Overall sentiment leans positive for those who persist with finding a supportive prescriber, though beginners feel overwhelmed navigating contradictory advice on forums.
Cite this answer
Clark, R. (2026). Switching from Levothyroxine to ERFA (NDT) – Advice on sourcing in Europe/UK spe. *CFP Weight Loss*. https://blog.cfpweightloss.com/ask/switching-from-levothyroxine-to-erfa-ndt-advice-on-sourcing-in-europe-uk-specifically-for-women-over-40
Russell Clark, FNP-C, APRN
About the Author

Russell Clark, FNP-C, APRN, is the founder of CFP Weight Loss in Nashville and CFP Fit Now telehealth. Over 35 years in healthcare — Army Nurse Reserves, Level 1 trauma ER, hospitalist — he developed a 30-week protocol integrating real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 30–90 pounds. He and his wife Anne-Marie lost a combined 275 pounds using the same protocol.

📖 The 30-Week Tirzepatide Reset — Get the Book →
Have a follow-up question?
More Questions 200 answered
▸ Used old Mounjaro pen by mistake - should I be worried and its effect on metabolism and insulin levels ▸ How I finally stopped crashing after workouts — the training structure that actually works with Hashimoto's — what do certified weight loss coaches recommend? ▸ Are Seed Oils Inflammatory for long-term maintenance (not just short-term) 📖 The Clark Protocol — Our evidence-based framework that combines clinical nurse practitioner expertise with personal experience to solve the o… ▸ Here's the things I wish I'd known back then... what are yours during the weight loss plateau phase ▸ Intermittent fasting did not work for me, did I give up too soon? ▸ Is the idea of the kitchen timer to eventually get to the point where someone has an orgasm just from hearing the ding? Pavlov's orgasm — evidence-based answer for CFP patients ▸ My deficit is moderate and reasonable. My mood says otherwise. Anyone else? ▸ Does the bloating really ever get better for those with hypothyroidism or Hashimoto's ▸ Is the idea of the kitchen timer to eventually get to the point where someone has an orgasm just from hearing the ding? Pavlov's orgasm: what to track and how to measure progress 📖 Inflammatory Markers — Clinical indicators like CRP that we monitor to ensure the body is moving from a state of disease to a state of vibrant … ▸ App that can predict symptoms before they get bad: best practices and common mistakes to avoid 📗 The 30-Week Tirzepatide Reset — Get Russell's complete protocol → ▸ My friends stopped being impressed by my weight loss ages ago. I just reached my goal weight, would you cheer for me in their place and how it connects to gut health and inflammation ▸ What do you actually wish you could track on glp1s: best practices and common mistakes to avoid 📖 Metabolic Reset — The process of retraining your body to utilize stored fat for fuel and regulating hunger hormones so you can maintain yo… ▸ Can we talk about the founder on a low-carb or ketogenic diet ▸ Calcium oxalate a problem if microdosing San Pedro powder? ▸ What is this new frozen hell — what does the research actually say? ▸ Are these test results normal? ▸ Anyone worried about the FDA crackdown — what most people get wrong about this ▸ Any advice for starting maintenance — evidence-based answer for CFP patients ▸ Are people fear mongering when they say compound pharmacies are dangerous — what do certified weight loss coaches recommend? 📖 High-Dose Dependency — The pharmaceutical trap of staying on maximum medication doses indefinitely, which we avoid through our smart cycling me… ▸ How I feel every time I go grocery shopping: how to talk to your doctor about this 📗 The 30-Week Tirzepatide Reset — Get Russell's complete protocol → ▸ Do I need a dose change on a low-carb or ketogenic diet ▸ 2.5 mg no longer working. Move to 3.5 on a low-carb or ketogenic diet 📖 Adipose Tissue Signaling — The way fat cells communicate with the brain; our goal is to fix these signals so the body stops defending an unnaturall… ▸ When period stopped did you feel like the worst pmdd of all time daily or: how to talk to your doctor about this ▸ Anyone have experience switching from compound injection to pill specifically for women over 40 ▸ My friends stopped being impressed by my weight loss ages ago. I just reached my goal weight, would you cheer for me in their place for long-term maintenance (not just short-term) ▸ Upped dosage + changing patch day for long-term maintenance (not just short-term) ▸ Guys, did you know the POWER of exercise for your body if you're on a GLP-1 like semaglutide or tirzepatide ▸ Did my hashimoto cause this — evidence-based answer for CFP patients ▸ What's a good Soy Sauce alternative for Asian Cuisine on a low-carb or ketogenic diet 📖 Modern Wheat Dangers — The hidden threat in hybridized grains that causes gut inflammation and spikes blood sugar more aggressively than pure t… 📗 The 30-Week Tirzepatide Reset — Get Russell's complete protocol → ▸ What’s the smallest habit that helped your insulin resistance the most — evidence-based answer for CFP patients ▸ Any women here that never had a flat stomach in their lives for long-term maintenance (not just short-term) ▸ PCOS linked to childhood trauma — evidence-based answer for CFP patients ▸ Any advice for starting maintenance on a low-carb or ketogenic diet ▸ Can you take beta blockers and GLP-1s together? ▸ PCOS + insulin resistance… belly fat won’t budge. what actually worked for you — what do certified weight loss coaches recommend? 📖 Smart Cycling — The strategic alternating of medication doses with planned 'off' periods to prevent receptor desensitization and ensure … ▸ Anyone worried about the FDA crackdown on a low-carb or ketogenic diet ▸ Used old Mounjaro pen by mistake - should I be worried specifically for women over 40 ▸ How I feel when tempted to get fast food during finals week: how to talk to your doctor about this ▸ Has Dr. Gundry spoken about the vaccine on a low-carb or ketogenic diet 📗 The 30-Week Tirzepatide Reset — Get Russell's complete protocol → ▸ Why has no doctor explained this to me: what to track and how to measure progress ▸ Has anyone here been diagnosed with endometriosis later in life — what does the research actually say? 📖 Refined Carbohydrates — Processed sugars and flours that strip the body of nutrients while driving the hormonal chaos responsible for the modern… ▸ Is it even worth it anymore if you're on a GLP-1 like semaglutide or tirzepatide ▸ When feeling down, remember that PCOS is what helped our ancestors survive during the weight loss plateau phase ▸ How I Lost 22lbs in 3 Months (155→133lbs at 5'8") after not being able to lose weight for a long time: best practices and common mistakes to avoid ▸ Can I ask where are we buying our bras? ▸ Fruit Salsa - First Week/Phase One Approved: what to track and how to measure progress ▸ How I finally stopped crashing after workouts — the training structure that actually works with Hashimoto's: best practices and common mistakes to avoid 📖 Tirzepatide — A dual-acting medication targeting both GLP-1 and GIP receptors, providing a more comprehensive metabolic signal than si… ▸ Smoking while on glp1 ▸ New menopause symptom, deep intense chills anyone on a low-carb or ketogenic diet 📗 The 30-Week Tirzepatide Reset — Get Russell's complete protocol → ▸ Does drinking Sparkling Ice (flavored sparkling water - 5 calories per bottle) during my fasting window break my fast?