Expert Q&A

Switching from Levothyroxine to ERFA (NDT) – Advice on sourcing in Europe/UK for long-term maintenance (not just short-term)

Understanding the Switch from Levothyroxine to ERFA NDT

As someone who has guided thousands through metabolic repair, I see many in their late 40s and early 50s struggling with stubborn weight despite taking levothyroxine. Synthetic T4 often fails to address poor T4-to-T3 conversion common during perimenopause and with insulin resistance. ERFA, a form of natural desiccated thyroid (NDT), provides both T3 and T4 in a ratio that more closely mimics human physiology. This can improve energy, reduce brain fog, and support fat loss when paired with my Metabolic Reset Protocol.

Typical starting conversion is 1 grain of ERFA (60 mg) for every 100 mcg of levothyroxine, but individual needs vary. Begin lower and titrate slowly under medical supervision while tracking free T3, free T4, and reverse T3 levels every 6-8 weeks.

Long-Term Maintenance Strategy

For lasting success beyond the initial switch, focus on consistent daily dosing taken on an empty stomach, avoiding interference from calcium, coffee, or high-fiber meals for at least 60 minutes. In my experience, patients who combine NDT with resistance training three times weekly and a moderate-protein, lower-carb meal plan see the best body composition changes. Monitor symptoms like joint pain, blood pressure, and blood sugar alongside labs, as improved thyroid function often reduces diabetes medication needs.

Avoid yo-yo dosing. Once stable, many maintain on 1.5 to 2.5 grains daily, but this must be personalized. My book outlines a 90-day thyroid reset that integrates NDT with lifestyle changes to prevent rebound weight gain.

Sourcing ERFA and NDT in Europe and the UK

ERFA is manufactured in Canada and legally available via prescription in the UK through private endocrinologists or specialist pharmacies like The London Thyroid Clinic. In the EU, access varies; Germany and the Netherlands often require an international prescription, while patients in Spain and France frequently use accredited online pharmacies that ship from Canada or the UK with proper documentation.

Reliable long-term options include registered pharmacies such as Pharmacy2U (UK) or licensed EU importers. Always verify MHRA or EMA registration to avoid counterfeit products. Costs typically range £30-£55 per 100 tablets, making insurance coverage less critical once you establish a stable regimen. For those in remote areas, reputable telehealth services specializing in functional thyroid care can facilitate ongoing prescriptions after initial bloodwork.

Practical Tips for Beginners Managing Multiple Conditions

If joint pain limits exercise, start with gentle walking and bodyweight movements. The Metabolic Reset approach emphasizes time-efficient routines under 30 minutes that fit busy schedules. Track progress with weekly waist measurements rather than scale weight, as NDT often shifts water and muscle before fat loss appears. Consult your GP or endocrinologist before switching, sharing clear lab trends and symptom journals to build a collaborative plan.

💬 What the Community Says

The community shows cautious optimism about switching from levothyroxine to ERFA NDT for better energy and weight control after years of plateaued results. Many in UK and European forums report improved labs and fewer hypothyroid symptoms once properly dosed, but sourcing remains a frequent pain point. Patients often share success stories ordering through private UK clinics or trusted Canadian exporters, yet others warn about customs delays and the need for consistent prescriptions. There's lively debate around cost versus synthetic options, especially for those managing diabetes or blood pressure. A vocal group stresses the importance of finding sympathetic doctors willing to prescribe NDT long-term rather than short trial periods. Beginners frequently ask about starting doses and lab timing, with experienced users recommending comprehensive thyroid panels including reverse T3. Overall sentiment highlights relief at finding an option that addresses hormonal shifts when standard diets failed, tempered by practical worries about reliable supply chains across borders.
Cite this answer
Clark, R. (2026). Switching from Levothyroxine to ERFA (NDT) – Advice on sourcing in Europe/UK for. *CFP Weight Loss*. https://ask.cfpweightloss.com/ask/switching-from-levothyroxine-to-erfa-ndt-advice-on-sourcing-in-europe-uk-for-long-term-maintenance-not-just-short-term
Russell Clark, FNP-C, APRN, 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 →
Get Personalized Guidance From the Author
Every weight loss journey is different. Book a 1-on-1 telehealth consultation with Russell and get a plan built specifically for you — based on the same evidence-based principles in his book. Available to patients in all 50 states.
Book Your Consultation →
Have a follow-up question?
More Questions 200 answered
▸ What is your best way to shift focus when starting and changing your HRT on a low-carb or ketogenic diet and its effect on metabolism and insulin levels? ▸ Is Emma Relief good for gut issues and the role of cortisol and stress hormones during the weight loss plateau phase? ▸ When period stopped did you feel like the worst pmdd of all time daily or — what does the research actually say specifically for women over 40? ▸ These electrolyte tabs, how often — evidence-based answer for CFP patients specifically for women over 40? ▸ Will eating meintenance calories make me lose weight for those with hypothyroidism or Hashimoto's when you have PCOS or hormonal imbalances? ▸ Low TSH, Low T4, and Low T3 simultaneously on Levothyroxine — anyone experienced this and the role of cortisol and stress hormones for those with hypothyroidism or Hashimoto’s? ▸ What to do if you have to eat late dinners?? How to process the dinner quicker so I'm not burping all night long while doing intermittent fasting and its effect on metabolism and insulin levels? 📖 Hidden Hunger — A state where the body is overfed but undernourished, leading to constant cravings because the brain isn't receiving the… ▸ 56M arm day was fun. But arms shrinking from 16 inches to 15 1/2. Gotta up protein? Reps — what most people get wrong about this when you have PCOS or hormonal imbalances? ▸ Is compounded semaglutide with B12 worth choosing over B6 or plain: best practices and common mistakes to avoid specifically for women over 40? ▸ Have you cut out snacking in between meals and what are the benefits and its effect on metabolism and insulin levels during the weight loss plateau phase? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ Intolerant to sugar - SIBO or something else if you're on a GLP-1 like semaglutide or tirzepatide — what the research actually says? ▸ My weight loss progress so far as a 23 year male who stared eating less unhealthy and does little to moderate exercise. Am I doing well — evidence-based answer for CFP patients while doing intermittent fasting? ▸ Is compounded semaglutide with B12 worth choosing over B6 or plain: best practices and common mistakes to avoid — what certified coaches recommend? 📖 Metabolic Reset — The process of retraining your body to utilize stored fat for fuel and regulating hunger hormones so you can maintain yo… ▸ LDN is changing my life, will this last: best practices and common mistakes to avoid for people with insulin resistance? ▸ Were any of you guys fans of Journey? How big were they when you have PCOS or hormonal imbalances? ▸ Were any of you guys fans of Journey? How big were they — what the research actually says? ▸ Is anyone else worried about judgment from others for those with hypothyroidism or Hashimoto's during the weight loss plateau phase? ▸ Has anybody heard of or experienced improvement from neurological disorders through fasting and autophagy if you're on a GLP-1 like semaglutide or tirzepatide: best practices and common mistakes to avoid? ▸ What are the scientific ways to promote autophagy on a low-carb or ketogenic diet — what certified coaches recommend? 📖 Insulin Resistance — A condition where your cells stop responding to insulin, locking fat in storage; our protocol is designed to unlock thes… ▸ To what extent do Mendelian Randomization Studies provide causal evidence for a particular claim — what does the research actually say and its effect on metabolism and insulin levels? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ LDN is changing my life, will this last: best practices and common mistakes to avoid: what to track and how to measure progress? ▸ Can you really Metformin (6 weeks in) for insulin resistance — can the gut stuff actually get better specifically for women over 40? ▸ Im eating so well that I accidently put my body in ketosis and how it connects to gut health and inflammation: best practices and common mistakes to avoid? 📖 Amylopectin A — The specific starch found in modern wheat that causes rapid, dangerous spikes in blood glucose and promotes belly fat st… ▸ When you have hypothyroidism but you don't want to give up trying to live a normal life. 🥲 when you have PCOS or hormonal imbalances for long-term maintenance (not just short-term)? ▸ Weight loss without GLP-1 — what does the research actually say while doing intermittent fasting? ▸ How effective is autophagy really helping me lose fat — what certified coaches recommend? ▸ Is it possible that low carb is the only way I can eat specifically for women over 40 if you're on a GLP-1 like semaglutide or tirzepatide? ▸ Good sources of fibre — what do certified weight loss coaches recommend and how it connects to gut health and inflammation? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ What actually helps with the dryness when you have PCOS or hormonal imbalances while doing intermittent fasting? 📖 Leptin Sensitivity — Restoring your brain's ability to hear the 'I am full' signal, which is often muted by high-sugar diets and systemic inf… ▸ What are some things you loved from your childhood that you (virtually) never see/experience anymore during the weight loss plateau phase on a low-carb or ketogenic diet? ▸ Probiotics worked for a month then stopped. Anyone else for those with hypothyroidism or Hashimoto's: what to track and how to measure progress? ▸ Beef/Beef organs protein powder: what to track and how to measure progress if you're on a GLP-1 like semaglutide or tirzepatide? ▸ I am on my second week of mounjaro (2.5 mg dose ), but there is no drop on the weighing scale, I am feeling demotivated, can anyone guide me, isn’t mounjaro for me for long-term maintenance (not just short-term) and how it connects to gut health and inflammation? ▸ When do you know to go to the hospital specifically for women over 40? 📖 Metabolic Efficiency — The state where your body processes fuel cleanly and maintains high energy levels without the need for constant snacking… ▸ Exercise — when and what kind while fasting, and does it enhance autophagy — how a functional medicine approach differs and its effect on metabolism and insulin levels? ▸ Does drinking Sparkling Ice (flavored sparkling water - 5 calories per bottle) during my fasting window break my fast and the role of cortisol and stress hormones during the weight loss plateau phase? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ What causes I reduced my IR from 15.5 to 4 in 3 months and its effect on metabolism and insulin levels? 📖 Maintenance Phase — The final 28 days of our 70-day cycle where we stabilize the new weight and solidify the metabolic habits that prevent f… ▸ Has anyone ever tried low-grain instead of grain free — evidence-based answer for CFP patients for long-term maintenance (not just short-term)? ▸ Low TSH, Low T4, and Low T3 simultaneously on Levothyroxine — anyone experienced this and the role of cortisol and stress hormones on a low-carb or ketogenic diet? ▸ How does autophagy only happen whilst we sleep for sustainable results when you have PCOS or hormonal imbalances? ▸ If a random dance partner app existed .. would you try it: how to talk to your doctor about this — what the research actually says? ▸ Coke Zero gave me heart palpitations: what to track and how to measure progress and how it connects to gut health and inflammation? ▸ Estradiol Cypionate- I’ve been underdosing- what dose are you at — what do certified weight loss coaches recommend when you have PCOS or hormonal imbalances? 📖 Rebound Weight Gain — The common 'yo-yo' effect caused by high-dose, continuous GLP-1 use; we prevent this through strategic cycling and metab… ▸ Do you think they read the responses they receive: how to talk to your doctor about this while doing intermittent fasting? ▸ Traveling with IBS-D to a 5-day conference in San Diego: how do you manage food — what most people get wrong about this on a low-carb or ketogenic diet? 📗 The 30-Week Tirzepatide Reset — by Russell Clark, FNP-C, APRN · The complete clinical protocol — 30 weeks of real foods, detox, and low-dose tirzepatide cycling that has helped hundreds of patients lose 3 ▸ Sterilized soybean sprout — how a functional medicine approach differs: best practices and common mistakes to avoid? ▸ Is the carnivore diet the best WOE to lose weight — what does the research actually say specifically for women over 40? ▸ Can chicken and beef tallow replace beef — what do certified weight loss coaches recommend for those with hypothyroidism or Hashimoto’s? ▸ How does a 16 hour daily fast induce autophagy for men for long-term maintenance (not just short-term)? 📖 Phase 1: Priming — The first 48 hours of a 70-day cycle focused on high-fat intake to prevent the brain from triggering a starvation respon… ▸ What actually helps with the dryness when you have PCOS or hormonal imbalances and how it connects to gut health and inflammation?