The importance of fiber in the diet is indisputable and has a profound impact on our digestive health and microbiome, our 100 trillion organism-strong “mini ecosystem.” Most Americans are fiber deficient—some experts in the functional medicine community claim that it’s the most clinically important dietary deficiency.

For those with hypothyroidism, carbohydrates are critical. I’ve seen too many people crash and burn on a low-carb diet—and lose a ton of hair.

Does quercetin slow thyroid function? Or does it support the thyroid? What about the hair growth claims? And does it work better than Zyrtec?