Biotin as a dietary supplement can skew blood test results, particularly for the thyroid, by causing laboratory reading errors without actually affecting your health.

noli's read

This advice is sound and supported by health authorities. The FDA (the American regulatory agency) has issued an official alert confirming that biotin can interfere with numerous laboratory tests because it is used in the measurement technology itself, potentially generating false results, such as simulated hyperthyroidism. This interaction is a well-documented phenomenon in clinical biochemistry and not a wellness myth. Regarding hair growth, scientific evidence (a review published in 'International Journal of Trichology') indicates that biotin is only beneficial for individuals with an actual deficiency, which is extremely rare in the general population. The idea that biotin is a miracle remedy to boost growth for everyone is therefore a commercial exaggeration not demonstrated by research. The community is in strong consensus here, alerting to a concrete risk rather than debating a theory.

the sources

1. 1r/HaircareScience