Parada

TRADITIONAL VIEW, WITH SAFETY LIMITS

What the texts say Parada does

• Rasayana — rejuvenative
• Yogavahi — carries the properties of what it is combined with
• Vrishya — aphrodisiac, supports reproductive vigour
• Deepana — kindles digestion (appetiser)

What the evidence says. Traditional use is extensively documented. Modern evidence is dominated by toxicology rather than efficacy: heavy-metal content in Ayurvedic preparations has been repeatedly reported in peer-reviewed analyses, with documented poisonings.

Side effects and limits

Mercury is a cumulative neurotoxin and nephrotoxin, and the classical processing is what the texts insist on for exactly that reason. Laisha does not treat the processing as a safety guarantee: preparations containing parada have repeatedly been found on analysis to carry mercury in forms and quantities that caused poisoning, and case reports of mercury toxicity from Ayurvedic preparations are documented in the medical literature.

Avoid or ask first: Pregnancy and breastfeeding — mercury crosses the placenta and is excreted in milk.; Children.; Renal impairment.; and more below.

A traditional classification, not a recommendation. The full safety record is below.

AS THE CLASSICAL TEXTS AND THE API PRESCRIBE

Parada is never given alone in any classical text. It appears inside a named yoga, in a stated ratio with gandhaka, after the samskara that yoga requires.

Reported from Sharangadhara Samhita and the Ayurvedic Pharmacopoeia of India. Laisha states what the texts prescribe; it does not recommend. No quantity here is adjusted for a particular person — not for agni, koshtha, bala, age, pregnancy, kidney or liver function, or anything already being taken.

Parada is classed among the Rasa — the chief of all rasa dravya.

Rasa, guna, virya, vipaka and karma are recorded as the classical texts give them, with the text and section named so a student can open the book and check.

Commercial mercury is not shuddha parada and the difference is the entire subject. Anything sold as parada without a stated shodhana is a chemical, not a dravya.

Elemental mercury, Hg. Liquid at room temperature, the only metal that is.

A WAY TO REMEMBER IT

Parada is para-da, that which carries one across — the name is about what it was believed to do, not what it looks like. Hydrargyrum, the source of the symbol Hg, is Greek for water-silver, which is what it looks like.

Parada is the foundation of Rasashastra and the subject of its first chapters. The tradition holds that it becomes medicine only through samskara and is otherwise a poison; that position is stated in the texts themselves and is not a modern gloss.

Constituents. Elemental mercury, Hg. Liquid at room temperature, the only metal that is.

• This is a study and clinical reference for practitioners and students. The matra and anupana it records are what the classical texts and the Ayurvedic Pharmacopoeia of India PRESCRIBE — Laisha reports them, it does not recommend them. They are not a prescription for any particular person, and they are not adjusted for your age, agni, koshtha, bala, pregnancy, kidney or liver function, or anything else you are already taking. Only a qualified practitioner who has examined you can do that.
• Traditional classification is recorded as what the classical texts say, with the text and the place in it named. It is not restated as a finding about a human body.
• Nothing here replaces a qualified Ayurvedic practitioner or a doctor.