Our hair formulas carry 5,000 and 6,000 mcg of biotin. The Daily Value is 30 mcg. Here's what that does to certain lab tests, and what to say before your next blood draw.
Hair Skin Nails
The Daily Value for biotin is 30 mcg. Most people get that from food: eggs, nuts, seeds, salmon.
Hair Skin Nails carries 5,000 mcg per serving. Hair Skin Nails Gummies carry 6,000 mcg. That's roughly 167 and 200 times the Daily Value. For contrast, Focus Complex carries 3 mcg.
Both hair formulas are in our Glow lineup, which is exactly why we read the research on what that dose does outside the follicle. One finding matters every time you get blood drawn.
Many lab tests are immunoassays. They use antibodies to catch one hormone or protein in your sample, then measure how much was caught.
A large share of these tests use biotin as a handle. The lab attaches biotin to a test antibody. A surface coated with streptavidin, a protein that grips biotin tightly, pulls the antibody and its target out of the sample for measurement.
Now add thousands of micrograms of biotin to the blood. Free biotin from your supplement occupies the streptavidin before the test antibody can. The capture step fails, in part or in full.
The direction of the error depends on the test design. In a sandwich assay, the signal rises with the target, so blocked capture reads falsely low. In a competitive assay, the signal falls as the target rises, so blocked capture reads falsely high.1
Li and colleagues measured this in healthy adults. Six people took 10 mg of biotin daily for a week. Of the 23 biotin-based assays tested, nine returned clinically important false results.2 Ten milligrams is 10,000 mcg, roughly double what either of our hair formulas carries. That's a different dose, not a safe harbor. The FDA's warning covers the high-dose biotin common in hair, skin, and nail products.1
Two come up again and again.
Thyroid panels. TSH is often a sandwich assay, so it can read low. Free T4 and T3 are often competitive, so they can read high. Together, that pattern can look like an overactive thyroid on paper in a person whose thyroid is fine.2
Troponin. Clinicians use this cardiac marker when someone has chest pain. Biotin can push some troponin assays falsely low. The FDA's 2017 communication reported a patient on high-dose biotin who died after falsely low troponin results.1
Other hormone tests can be affected too. Not every lab uses a biotin-based method for every test, and methods differ from lab to lab. That's why the lab is the right place to ask.
Year-end physicals mean a lot of blood work in the next two months. The fix takes one sentence.
Tell whoever orders your blood work that you take biotin, and how much. Then ask the lab how long to pause it before the draw.
We don't give a fixed washout window. It depends on your dose and on the specific test, and the lab knows which of its methods use biotin. Count every source: a hair formula, a multivitamin, and a B-complex can all carry it.
If you've already had results that didn't match how you feel, mention your biotin intake to your clinician. A retest after a pause is a common next step.
Biotin deficiency is uncommon in people who eat a varied diet. Patel and colleagues reviewed the published cases of biotin used for hair and nails. Every reported improvement came from someone with an underlying cause, such as an inherited enzyme disorder or acquired deficiency.3
So biotin isn't a universal hair fix, and we won't sell it as one. Our honest guide to hair loss supplements covers what else drives shedding.
Biotin supports keratin production, the structural protein in hair and nails.* That's why it sits beside zinc, vitamin C, and silica in Hair Skin Nails, and beside marine collagen and 12 other actives in the gummies.
Both formulas run Daily on our Smart Cycling protocol. Biotin has no cycling threshold. It's a water-soluble vitamin with no receptor tolerance to reset, so there is no on/off rhythm to follow. That also means it's in your blood every day, including the morning of a lab draw.
If biotin is part of your Glow stack, keep taking it. Just say so before the needle goes in.
*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.
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