Amy Myers MD Review: Check the Biotin Before Your Blood Test
Amy Myers MD sells functional medicine supplements and protocols aimed at thyroid health, gut health and autoimmune support, generally between about $25.97 and $57.97 with subscribe-and-save discounts. The brand is physician-founded and better presented than much of the category. There is one concrete, checkable issue worth leading with, because it affects medical decisions rather than just wallets: high-dose biotin, common in hair, skin and nail formulas, can make thyroid blood tests read incorrectly.
Verified August 24, 2026. Amy Myers MD is a supplement company. Nothing here replaces medical advice or prescribed treatment. For weight-loss medication see our GLP-1 provider rankings.
Affiliate disclosure: Rx Saver Hub earns a commission if you sign up through links on this page. It does not change what we write — see our disclosure policy.
Verdict: Well-presented supplements built on a diagnostic framework that is more popular than it is established. Functional medicine covers a wide range of practice, and some of its emphases — nutrition, sleep, considering the whole person — are entirely sensible. Others, including several conditions this category treats as settled, are not recognised diagnoses in mainstream medicine. The specific and actionable problem is biotin: many formulas here and across the category contain doses high enough to interfere with common laboratory immunoassays, including thyroid tests, and patients are rarely told.
What Amy Myers MD Costs
Amy Myers MD prices per product with subscription discounts and frequent promotions.
| Plan | What you get | Listed | Real cost |
|---|---|---|---|
| Core supplements | Single formulations | $25.97 to $43.97 | Bulk of the range |
| Premium products | Higher-cost formulations | $49.97 to $57.97 | Protocol components |
| Subscribe and save | Recurring orders | 25% off first order | Standard discount |
| Protocol bundles | Multi-product stacks | Adds up quickly | Judge annual cost |
High-dose biotin can make your thyroid test read wrong
Biotin at the doses common in hair, skin and nail supplements interferes with many laboratory immunoassays, including thyroid function tests, and can produce results that mimic hyperthyroidism or mask hypothyroidism. This is a well-documented analytical interference, not a theory — the FDA has issued safety communications about it. Tell your doctor and the phlebotomist about every supplement you take, and ask whether to stop biotin before bloodwork; a pause of a few days is commonly advised. This matters especially on a GLP-1, where thyroid history is part of the eligibility conversation.
Protocol bundles multiply cost quickly. Work out the annual figure for the full stack before starting one.
The biotin issue is the actionable part
Biotin is added generously to hair, skin and nail supplements, often at doses many times any dietary requirement. Those doses can interfere with immunoassay-based laboratory tests, which include common thyroid panels and several cardiac markers.
The consequence is not subtle. Interference can push results in a direction that mimics thyroid disease or conceals it, potentially leading to a wrong diagnosis or an inappropriate medication change. This has been documented well enough to prompt regulatory safety communication.
The fix is trivial: tell whoever orders your bloodwork what you take, and ask whether to stop biotin beforehand. A few days is commonly advised. Nobody will do this for you if you do not mention it.
Reading functional medicine claims
Functional medicine spans a wide range. Its better instincts — attention to nutrition, sleep, stress and the whole person rather than an isolated symptom — are unobjectionable and often underweighted in conventional care.
Its weaker end treats conditions as established that mainstream medicine does not recognise as diagnoses, and builds supplement protocols around them. Those protocols are frequently expensive, frequently long, and rarely tested as protocols in the way a medication would be.
A useful filter: ask what specific claim a product is making and what evidence supports that specific claim. Ingredients with reasonable support exist in this category alongside ingredients with none, and the packaging does not distinguish them.
Thyroid and GLP-1 medication specifically
This matters more than usual for readers here. GLP-1 receptor agonists carry a boxed warning regarding thyroid C-cell tumours based on rodent studies, and a personal or family history of medullary thyroid carcinoma or MEN 2 is a contraindication. Thyroid history is part of the eligibility conversation.
Separately, if you take levothyroxine, absorption is affected by timing relative to food and to certain supplements — calcium and iron in particular. Delayed gastric emptying from a GLP-1 may also affect absorption of oral medications generally, which is worth raising with your prescriber.
None of this means avoiding supplements. It means telling every clinician involved what you actually take.
Pros and Cons
Strengths
- Physician-founded with clearer presentation than much of the category
- Names ingredients rather than relying on proprietary blends
- Subscribe-and-save discounts and frequent promotions
- Some individual ingredients have reasonable supporting evidence
Drawbacks
- High-dose biotin can interfere with thyroid and other lab tests
- Built partly on diagnostic frameworks not recognised in mainstream medicine
- Protocol bundles escalate cost quickly
- Protocols are rarely tested as protocols
- Dietary supplements are not FDA-reviewed for effectiveness before sale
Who Should Pick It — and Who Shouldn't
Good fit
Someone who evaluates individual products against the specific claims made for them, tells every clinician what they take, and pauses biotin before bloodwork.
Look elsewhere
Anyone starting a multi-product protocol for a condition their doctor has not diagnosed, and anyone taking biotin without mentioning it before a thyroid test.
Frequently Asked Questions
Can supplements affect my thyroid blood test?
Yes. High-dose biotin, common in hair, skin and nail formulas, interferes with many laboratory immunoassays including thyroid tests, and can produce results mimicking or masking thyroid disease. Tell your doctor what you take and ask whether to stop biotin before bloodwork — a few days is commonly advised.
Do I need thyroid supplements on a GLP-1?
Not unless a doctor has identified a specific deficiency. GLP-1 medications carry a boxed warning regarding thyroid C-cell tumours from rodent studies, and a personal or family history of medullary thyroid carcinoma or MEN 2 is a contraindication — that is a conversation with your prescriber, not a supplement decision.
Is functional medicine legitimate?
It spans a wide range. Attention to nutrition, sleep and the whole person is sensible and often underweighted elsewhere. Some conditions the category treats as established are not recognised diagnoses in mainstream medicine. Evaluate specific claims against specific evidence rather than the framework as a whole.
Will supplements interfere with my other medication?
They can. Calcium and iron affect levothyroxine absorption, and delayed gastric emptying from a GLP-1 may affect oral medication absorption generally. Bring a full list of everything you take to a pharmacist — it is free and it is what they are for.
Considering Amy Myers MD?
If you take a hair, skin and nail supplement and have a thyroid test coming up, ask whether to pause the biotin first. That single question is the most useful thing on this page.
More Reviews Like This
Other brands we have reviewed in the same category.
Pricing and product range read from store.amymyersmd.com on August 24, 2026 and subject to change. Biotin laboratory interference reflects published FDA safety communication. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease. Rx Saver Hub earns a commission on purchases made through links on this page.