Not best product: NP thyroid is derived from the thyroid of pigs from slaughterhouses. It contains a mixture of T4 and T3. T3 is rapid acting, and may give you a "boost" after taking it. If you're older, this boost can accelerate your heart rate and potentially cause problems. Many people on these T4/T3 products are being overtreated. Best to stick with synthetic levothyroxine, adjusted to the correct dose.
Answered 10/22/2019
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