Peng Sha (Borax)

Chinese Herb Actions

Chinese Herb Dosage

• What is the dosage of Peng Sha (Borax)?

  Sacred Lotus does not publish dosage, preparation, or administration guidance for Borax. Borax (sodium tetraborate) is classified in the European Union as a reproductive toxicant (see Toxicity below), ingestion has caused documented poisonings including infant fatalities, and most contemporary Chinese-medicine materia medica references now treat it as an obsolete substance rarely if ever prescribed. Any historical use was under professional supervision and for short, closely limited courses; this page exists as a safety/identity reference, not a usage guide.

  Source: regulatory and toxicology material cited under Toxicity, below.

Chinese Herb Contraindications & Cautions

• Is Borax safe? What are the cautions?

  No — Borax carries a modern reproductive-toxicity classification and a documented history of serious poisoning, including in infants, and it should not be self-administered internally under any circumstances. It is contraindicated in pregnancy (see Toxicity). Historical Chinese-medicine sources that still discuss internal use restrict it to short courses (a matter of days) under professional supervision and warn against prolonged use; most modern materia medica references now classify it as obsolete rather than actively prescribed.

  • Pregnancy — contraindicated; see the EU reproductive-toxicant classification under Toxicity.
  • Children/infants — historically implicated in accidental poisoning and fatalities in infants; not a household or self-care substance.
  • Not for unsupervised internal use — any historical internal use required professional supervision and short duration; this is reference information, not usage guidance.

  Source: toxicology and regulatory sources cited under Toxicity, below.

Chinese Herb Toxicity & Overdose

• Is Borax toxic, and how is it regulated?

  Yes — borax (sodium tetraborate) is classified in the European Union as a reproductive toxicant (CLP Regulation 1272/2008: Repr. 1B, H360FD “may damage fertility or the unborn child”), and it has a documented history of acute poisoning, including fatal infant poisonings. Under REACH Annex XVII (restriction entry 30), Category 1B reproductive toxicants including borax cannot be sold to the general public above a low concentration threshold, which is why borax largely disappeared from EU consumer products after the 2010 classification. It is banned as a food additive in the United States, the European Union, and other jurisdictions.

  • Acute poisoning — ingestion can cause nausea, persistent vomiting, abdominal pain, and diarrhea; historical cases include infant deaths in the 1960s after boric-acid disinfectant was mistakenly used to prepare infant formula, and infant seizures in the 1970s–80s linked to a borax-and-honey teething remedy applied to pacifiers. Estimated lethal doses cited in poisoning literature are roughly 2–3 g in infants versus roughly 15 g in adults, though individual sensitivity varies and these figures should be treated as approximate historical estimates, not clinical thresholds.
  • Reproductive/developmental toxicity (animal data) — in rats, mice, and dogs, boron compounds produced dose-dependent testicular damage (initially reversible inhibition of sperm release, progressing to tissue disorganization and atrophy at higher/longer exposures); the most sensitive endpoint identified across studies is prenatal/fetal development, with a no-observed-adverse-effect level (NOAEL) around 9.6 mg boron/kg body weight/day for developmental effects and about 17.5–26 mg boron/kg body weight/day for male fertility effects in rats.
  • Human epidemiological data (contested) — occupational cohort studies of highly boron-exposed workers in Turkey and China have not found clear evidence of reproductive harm, and several toxicologists have argued the EU’s Category 1B classification should be downgraded to Category 2 on this basis; as of current data the harmonised EU classification remains Category 1B.

  Note: the underlying animal toxicity data are well established, but experts disagree on whether they translate into demonstrated human reproductive risk at real-world exposure levels — both the hazard classification and the counter-evidence are presented above rather than resolved one way.

  Source: EU CLP Regulation (EC) 1272/2008 harmonised classification for boric acid/borates; REACH Annex XVII restriction entry 30; PMID 9431568; PMID 7889888; PMID 32170343; PMID 22686310; PMID 26511087. Reference/safety information, not a clinical risk assessment.

Herb-Drug Interactions

• No well-established clinical herb–drug interactions are documented for Borax in the literature reviewed; published research on borax/boric acid focuses on toxicology (reproductive/developmental effects, acute poisoning) rather than pharmacokinetic interactions with medications. Given its toxicity profile and largely obsolete status in contemporary practice, any historical internal use would require professional supervision regardless of concurrent medications. (Absence of documented interactions reflects limited modern clinical use, not a safety guarantee.)

Western / Biomedical Research

Chinese Herb Clinical Studies & Research

Provided as research context — a summary of published biomedical study, not a therapeutic or medical claim.

• Is there modern research on Borax (sodium tetraborate) toxicity?

  Yes — borax and boric acid are among the more extensively studied boron compounds in reproductive toxicology, with a substantial animal database and an ongoing scientific debate about human relevance. The European Chemicals Agency’s harmonised classification (Repr. 1B, H360FD) is based primarily on rodent and dog studies rather than confirmed human effects.

  • Foundational reproductive-toxicity studies — early rodent dietary studies (1000–9000 ppm) established the pattern of male reproductive toxicity: reversible inhibition of sperm release at lower doses, progressing to testicular tissue disorganization and atrophy at higher doses or longer exposure.
  • Developmental toxicity — a 1998 review of general, reproductive, developmental, and endocrine toxicity of boronated compounds identified fetal/developmental effects as the most sensitive endpoint, with a NOAEL of about 9.6 mg boron/kg body weight/day, and concluded the likelihood of human toxicity from normal-activity exposure is remote.
  • Occupational exposure reconciliation — a 2012 review comparing blood-boron levels in highly exposed workers (China, Turkey) against the animal NOAELs found human exposures, even in the most highly exposed cohorts, remain several-fold below the levels associated with reproductive effects in animals.
  • Human epidemiological assessment — a 2016 analysis of a Turkish boric-acid production facility (204 male workers) found no significant unfavorable effects on sperm parameters or reproductive hormones despite very high occupational boron exposure, and the authors argued for reclassification from Category 1B to Category 2; the EU classification has not been changed on this basis as of current data.
  • 2020 review synthesis — a 2020 Archives of Toxicology review of boron compounds and human reproduction concluded that reproductive-toxicity thresholds established in animal studies are not reached under normal handling, use, or even extreme occupational human exposure conditions.

  Overall: the animal reproductive/developmental toxicity data are robust and form the basis of the current EU hazard classification and REACH restrictions; human epidemiological evidence to date has not confirmed the same effects at real-world exposure levels, and this gap is actively debated among toxicologists rather than settled.

  Sources: PMID 7889888 (Chapin & Ku, Environ Health Perspect, 1994, rodent reproductive toxicity); PMID 9138630 (IEHR Expert Scientific Committee assessment of boric acid and borax); PMID 9431568 (Fail et al., Reprod Toxicol, 1998, general/reproductive/developmental/endocrine toxicity review); PMID 22686310 (Bolt, Başaran & Duydu, J Toxicol Environ Health A, 2012, occupational exposure reconciliation); PMID 26511087 (Duydu et al., Curr Drug Deliv, 2016, Turkish worker cohort epidemiology); PMID 32170343 (Bolt, Başaran & Duydu, Arch Toxicol, 2020, review). Toxicology/regulatory research context, not a therapeutic claim.

Chinese Herb Notes

• What is Peng Sha (Borax), chemically and in the Sacred Lotus database?

  Peng Sha is the Chinese-medicine name for borax, a naturally occurring hydrated sodium borate mineral (sodium tetraborate decahydrate, Na₂B₄O₇·10H₂O), historically mined from evaporite deposits and also produced industrially. In the Sacred Lotus database it is classified under “Substances for External Application,” alongside other topical mineral/detoxifying substances, reflecting its primary historical role as a local rather than internal remedy.

  • Related substance class — Borax sits in the same general topical-mineral group as other externally applied detoxifying/drying substances (e.g., Ming Fan/alum); sources differ on close comparisons, so no direct differentiation is asserted here.
  • Modern status — because of the toxicity and regulatory findings summarized below, Borax has fallen out of use in most contemporary Chinese-medicine practice and is described as obsolete in leading modern materia medica.

  Source: Sacred Lotus database identity fields; Bensky, Clavey & Stöger, Chinese Herbal Medicine: Materia Medica (3rd ed.).