Is Boric Acid Toxic to Reproduction in Humans? Assessment of the Animal Reproductive Toxicity Data and Epidemiological Study Results

Title:Is Boric Acid Toxic to Reproduction in Humans? Assessment of the Animal Reproductive Toxicity Data and Epidemiological Study Results

Volume: 13 Issue: 3

Author(s): Yalçın Duydu, Nurşen Başaran, Aylin Ustündağ, Sevtap Aydın, Ulkü Undeğer, Osman Yavuz Ataman, Kaan Aydos, Yalçın Düker, Katja Ickstadt, Brita Schulze Waltrup, Klaus Golka and Hermann Maximilian Bolt

Affiliation:

Keywords: Boron exposure, developmental toxicity, reproductive toxicity, sperm quality parameters.

Abstract: Boric acid and sodium borates are classified as toxic to reproduction in the CLP Regulation under “Category 1B” with the hazard statement of “H360FD”. This classification is based on the reprotoxic effects of boric acid and sodium borates in animal experiments at high doses. However, boron mediated reprotoxic effects have not been proven in epidemiological studies so far. The epidemiological study performed in Bandırma boric acid production plant is the most comprehensive published study in this field with 204 voluntarily participated male workers. Sperm quality parameters (sperm morphology, concentration and motility parameters), FSH, LH and testosterone levels were determined in all participated employees as the reproductive toxicity biomarkers of males. However, boron mediated unfavorable effects on reproduction in male workers have not been determined even in the workers under very high daily boron exposure (0.21 mg B/kg-bw/day) conditions. The NOAEL for rat reproductive toxicity is equivalent to a blood boron level of 2020 ng/g. This level is higher than the mean blood boron concentration (223.89 ± 69.49 ng/g) of the high exposure group workers in Bandırma boric acid production plant (Turkey) by a factor of 9. Accordingly, classifying boric acid and sodium borates under “Category 1B” as “presumed reproductive human toxicant in the CLP regulation seems scientifically not reasonable. The results of the epidemiological studies (including the study performed in China) support for a down-classification of boric acid from the category 1B, H360FD to category 2, H361d, (suspected of damaging the unborn child).

Cite this article as:

Duydu Yalçın, Başaran Nurşen, Ustündağ Aylin, Aydın Sevtap, Undeğer Ulkü, Yavuz Ataman Osman, Aydos Kaan, Düker Yalçın, Ickstadt Katja, Schulze Waltrup Brita, Golka Klaus and Maximilian Bolt Hermann, Is Boric Acid Toxic to Reproduction in Humans? Assessment of the Animal Reproductive Toxicity Data and Epidemiological Study Results, Current Drug Delivery 2016; 13 (3) . https://dx.doi.org/10.2174/1567201812666151029101514