Dietary nitrate supplementation has been widely investigated by the scientific community due to its beneficial effects on the cardiovascular system. However, there is evidence suggesting a possible effect of nitrate in scavenger iodine from the thyroid gland, which may affect thyroid hormone synthesis. Therefore, this study evaluated the effect of seven days of a nitrate-rich beetroot juice supplementation on thyroid hormones and iodine concentrations in healthy adults. Thirteen healthy adults were enrolled in a randomized, double-blind, crossover and placebo-controlled study. Participants ingested 140 mL of nitrate-rich beetroot juice (8.12 ± 3.61 mmol/day) or placebo (nitrate-depleted BJ) during one week. Before and after the supplementation period, blood and urine were drawn for analysis of thyroid hormones, iodine, nitrate and nitrite. No significant changes were observed in plasma triiodothyronine, thyroxine, nitrate and nitrite, and urinary iodine concentrations. In conclusion, these results suggest that one-week supplementation with a nitrate-rich beetroot juice intake does not affect thyroid function.

膳食硝酸盐补充剂由于其对心血管系统的有益作用，已被科学界广泛研究。然而，有证据表明硝酸盐可能对甲状腺中的碘清除剂产生影响，这可能会影响甲状腺激素的合成。因此，这项研究评估了健康成年人中富含硝酸盐的甜菜根汁补充7天对甲状腺激素和碘浓度的影响。13名健康成年人参加了一项随机，双盲，交叉和安慰剂对照研究。参与者在一周内摄入了140 mL富含硝酸盐的甜菜根汁（8.12±3.61 mmol /天）或安慰剂（贫硝酸的BJ）。在补充期间之前和之后，抽取血液和尿液用于分析甲状腺激素，碘，硝酸盐和亚硝酸盐。血浆三碘甲状腺素，甲状腺素，硝酸盐和亚硝酸盐以及尿中碘浓度未见明显变化。总之，这些结果表明，每周补充富含硝酸盐的甜菜根汁摄入量不会影响甲状腺功能。