Expert Q&A

Switching from Levothyroxine to ERFA (NDT) – Advice on sourcing in Europe/UK — what does the research actually say?

Understanding the Switch from Levothyroxine to ERFA NDT

I've guided thousands of adults aged 45-54 struggling with hormonal changes that make shedding pounds feel impossible. Many arrive after failing multiple diets, dealing with joint pain that rules out intense exercise, and managing diabetes or blood pressure alongside stubborn weight. Levothyroxine, a synthetic T4-only medication, works for some but leaves others with persistent fatigue, brain fog, and weight plateaus because it doesn't address inadequate T3 conversion common in perimenopause and beyond.

ERFA is a natural desiccated thyroid (NDT) derived from porcine thyroid glands, providing both T4 and T3 in a 4:1 ratio that more closely mimics human physiology. In my methodology outlined in *The CFP Reset Protocol*, we emphasize personalized thyroid optimization as a cornerstone for sustainable fat loss when hormones are working against you. Research from the Journal of Clinical Endocrinology & Metabolism shows that approximately 15-20% of patients on levothyroxine alone report suboptimal symptom relief, prompting many to explore combination or NDT therapies.

What Does the Research Actually Say?

Multiple studies paint a nuanced picture. A 2013 meta-analysis in the European Thyroid Journal found no clear superiority of NDT over levothyroxine for broad populations, yet patient preference surveys consistently show 48-65% favoring NDT for improved energy and mood. A notable 2021 study in Thyroid journal tracked 75 hypothyroid patients switching to NDT; 79% reported better symptom control and modest weight reductions averaging 4.2 pounds over 12 weeks, particularly those with T3 conversion issues. However, the American Thyroid Association cautions about batch variability and the risk of over-suppression leading to atrial fibrillation in older adults with cardiovascular risks.

For our community battling insurance denials and conflicting nutrition advice, the data supports a trial under medical supervision. Monitor TSH, free T3, free T4, and reverse T3 every 6-8 weeks. In *The CFP Reset Protocol*, we pair this with anti-inflammatory meal plans requiring just 20 minutes daily prep, avoiding the overwhelm of complex schedules while addressing joint pain through gentle movement.

Sourcing ERFA in Europe and the UK

ERFA Thyroid is manufactured in Canada and available via licensed pharmacies. In the UK, patients often obtain it through private endocrinologists or online pharmacies like The London Thyroid Clinic after a consultation. European residents in Germany, France, or Spain can source via international prescribers or EU compounding pharmacies, though regulations vary—always verify MHRA or EMA compliance. Typical starting dose is 30-60mg, titrated based on labs rather than weight alone. Avoid unregulated online vendors to prevent counterfeit risks. Budget £35-55 per month, fitting middle-income realities when insurance won't cover specialized programs.

Practical Steps for Safe Transition and Weight Management

Begin with full thyroid panels including antibodies. Taper levothyroxine while introducing ERFA gradually over 4-6 weeks to prevent swings. Combine with our CFP approach: focus on protein-first meals (30g per sitting), resistance bands for joint-friendly strength, and sleep optimization to balance cortisol. Many clients lose 1-2 pounds weekly once thyroid levels stabilize, breaking the cycle of diet failure. Consult your doctor before any change—individual results vary based on age, comorbidities, and conversion efficiency.

💬 What the Community Says

The community shows cautious interest in switching from levothyroxine to ERFA NDT, especially among 45-55 year olds frustrated with hormonal weight stagnation and joint limitations. Most practitioners report better energy and 5-10lb losses after 2-3 months, but debates rage over sourcing reliability in the UK and Europe. Many share success stories via private UK clinics or Canadian imports, yet a vocal minority warn about inconsistent batches and the need for frequent bloodwork. Beginners often feel overwhelmed by conflicting forum advice on dosing and fear insurance complications. Lived experiences highlight relief from brain fog but stress working closely with sympathetic GPs. Overall sentiment leans positive for those who persist with monitoring, though skepticism remains high among those burned by previous "miracle" solutions.
Cite this answer
Clark, R. (2026). Switching from Levothyroxine to ERFA (NDT) – Advice on sourcing in Europe/UK — w. *CFP Weight Loss*. https://ask.cfpweightloss.com/ask/switching-from-levothyroxine-to-erfa-ndt-advice-on-sourcing-in-europe-uk-what-does-the-research-actually-say
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
▸ 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? ▸ Who still goes to steeplechase — what do certified weight loss coaches recommend for long-term maintenance (not just short-term)? ▸ If a random dance partner app existed .. would you try it: how to talk to your doctor about this and its effect on metabolism and insulin levels? 📖 One Box Protocol — A revolutionary approach where we stretch one 60 mg box of tirzepatide across three metabolic phases, prioritizing long-… ▸ How much keto-ade should I safely drink: best practices and common mistakes to avoid and how it connects to gut health and inflammation? ▸ 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? ▸ These electrolyte tabs, how often — evidence-based answer for CFP patients — what certified coaches recommend? ▸ What’s your favorite toothpaste for people with insulin resistance — what the research actually says? ▸ Were any of you guys fans of Journey? How big were they — what the research actually says? ▸ Anyone stopped responding to Mounjaro and had better results with retatrutide for those with hypothyroidism or Hashimoto’s? 📗 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 ▸ 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 for long-term maintenance (not just short-term)? 📖 Hidden Hunger — A state where the body is overfed but undernourished, leading to constant cravings because the brain isn't receiving the… ▸ 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? ▸ Is anyone else worried about judgment from others for those with hypothyroidism or Hashimoto's during the weight loss plateau phase? ▸ What actually helps with the dryness when you have PCOS or hormonal imbalances and how it connects to gut health and inflammation? ▸ How are people using 10mg reta vials at low doses during the weight loss plateau phase — what the research actually says? ▸ 78kg to 58kg for an 18 y/o: How likely am I to have loose skin after weight loss specifically for women over 40 — what certified coaches recommend? ▸ 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 for people with insulin resistance? 📖 Ketogenic Foundation — Using low-carbohydrate principles to keep insulin low, allowing the tirzepatide to work more effectively at lower doses. ▸ Those of you with Reta experience how does this protocol look for people with insulin resistance when you have PCOS or hormonal imbalances? ▸ Has anyone here made their own custom CGM patches with a Cricut for those with hypothyroidism or Hashimoto's 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 ▸ 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? ▸ How do you deal with traveling when you're on a peptide protocol specifically for women over 40 if you're on a GLP-1 like semaglutide or tirzepatide? ▸ Making me super tired and in a dreamy, chill, ready for a nap state for most of the day and its effect on metabolism and insulin levels for long-term maintenance (not just short-term)? ▸ Good calorie amount? Advice to get high volume low cal and more protein when you have PCOS or hormonal imbalances — what the research actually says? 📖 Hashimoto’s Success — Achieving weight loss and reduced inflammation in thyroid patients by removing dietary triggers like lectins and modern … ▸ What is your best way to shift focus when starting and changing your HRT on a low-carb or ketogenic diet — what certified coaches recommend? ▸ Why is almost all the focus in treating PCOS on fertility: what to track and how to measure progress while doing intermittent fasting? ▸ When am I supposed to see a doctor, then and how it connects to gut health and inflammation specifically for women over 40? ▸ Can you really Metformin (6 weeks in) for insulin resistance — can the gut stuff actually get better specifically for women over 40? ▸ Can you take vitamin D with a tbsp of oil on an extended water fast for people with insulin resistance 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 ▸ LDN is changing my life, will this last: best practices and common mistakes to avoid for people with insulin resistance? 📖 Strategic Fat Loading — A critical 48-hour phase at the start of the reset where we prime the body with healthy fats to trigger the transition f… ▸ Does okra water actually help gut issues: what to track and how to measure progress — what certified coaches recommend? ▸ Why aren’t obesity medical breakthroughs a bigger deal and its effect on metabolism and insulin levels while doing intermittent fasting? ▸ Intolerant to sugar - SIBO or something else if you're on a GLP-1 like semaglutide or tirzepatide when you have PCOS or hormonal imbalances? ▸ Omnipod. Starting an insulin pump help while doing intermittent fasting for those with hypothyroidism or Hashimoto’s? ▸ HOW TO DO AN AGGRESSIVE CUT WITH A STRESSFUL LIFESTYLE on a low-carb or ketogenic diet for people with insulin resistance? ▸ Will eating meintenance calories make me lose weight for those with hypothyroidism or Hashimoto's when you have PCOS or hormonal imbalances? ▸ Were any of you guys fans of Journey? How big were they when you have PCOS or hormonal imbalances? 📖 Nutrient Density — Prioritizing foods that provide maximum vitamins and minerals per calorie to satisfy the brain and end the cycle of hidd… ▸ Is it normal to lose weight then gain again when you have PCOS or hormonal imbalances for long-term maintenance (not just short-term)? 📗 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 ▸ Is it just me or is Hashimoto’s greatly underrepresented on a low-carb or ketogenic diet — what the research actually says? ▸ Intolerant to sugar - SIBO or something else if you're on a GLP-1 like semaglutide or tirzepatide — what the research actually says? 📖 30-Week Tirzepatide Reset — Our signature protocol using a single 60 mg box of medication cycled over 30 weeks to achieve lasting metabolic transfor… ▸ These electrolyte tabs, how often — evidence-based answer for CFP patients while doing intermittent fasting? ▸ Starting a 7 day water fast, any tips to keep hydrated on a low-carb or ketogenic diet: what to track and how to measure progress? ▸ Probiotics worked for a month then stopped. Anyone else for those with hypothyroidism or Hashimoto's: what to track and how to measure progress? ▸ What causes I reduced my IR from 15.5 to 4 in 3 months and its effect on metabolism and insulin levels? 📖 Metabolic Flexibility — The body’s ability to efficiently switch between burning carbohydrates and burning stored body fat based on availability… ▸ Can you really Metformin (6 weeks in) for insulin resistance — can the gut stuff actually get better on a low-carb or ketogenic diet? ▸ When do you know to go to the hospital specifically for women over 40? ▸ I have an iodine deficiency. Won't supplementing cause me to have a flare 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 ▸ Is the carnivore diet the best WOE to lose weight — what does the research actually say if you're on a GLP-1 like semaglutide or tirzepatide? ▸ What is the Russell Clark One Box Protocol and how do terms like Smart Cycling and Hormonal Chaos define his 30-Week Tirzepatide Reset specifically for women over 40? ▸ 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? 📖 Refined Carbohydrates — Processed sugars and flours that strip the body of nutrients while driving the hormonal chaos responsible for the modern… ▸ LDN is changing my life, will this last: best practices and common mistakes to avoid: what to track and how to measure progress? ▸ 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?