Laymen explanation
Swarna (Gold_ is taken in the form of bhasma(). Administering Gold calx in very minute quantities has been hailed since the times of Kashyapa and Vagbhata.
Vagbhata – in Ashtanga Hrudayam 7th chapter says,
Na Sajjate Hemapange padmapatre ambuvat visham ||
सुवर्णप्राशनं हि एतत् मेधाग्नि बल वर्धनम् । आयुष्यं मंगलं पुण्यं वृष्यं ग्रहापहम् ॥
मासात् परम मेधावी व्याधिभिर्न च दृश्यते । षड्भि मासै: श्रुतधर सुवर्ण प्राशनात् भवेत् ॥
(काश्यप संहिता, सूत्रस्थानम्)
By administering Swarna for a month time, child becomes super-intelligent.
By administering for up to six months, person becomes Shruta Dhara – can remember whatever she hears.
Swarna, the Sara Lauha[6] is an important, noble metal known to Indians since antiquity. References can be traced back to Charaka and Sushruta Samhita where the noble metal has been attributed with a wide range of applications. The ‘Bhasma’ form of Gold is in metallic state. Quantitatively it is a combination of metallic Gold (96.76%), silica (1.14%), ferric oxide (0.14%), phosphates (0.78%), potash (0.16%), salt (0.078%), and traces of copper and magnesium.[7]
In its elemental form, Gold has been employed for centuries as an anti-pruritic agent to relieve itching palms. In 1980, Robert Koch observed that gold inhibits Mycobacterium tuberculosis in vitro. This led to trials on arthritis and lupus erythematosus. Also, previous studies carried out in 1973 on gold and its compounds observed beneficial activities at different levels. Gold compounds have the ability to decrease concentrations of rheumatic factors and influences the immunological responses.[53] It has also been established[54] that gold suppresses the anaphylactic release of histamine more effectively than gluco-corticoids. Sodium aurothio malate (water soluble preparation) was introduced around 25 years ago to treat arthritis, and is administered through IM injections. Its pharmacokinetics were not established but, its effects are probably due to its antimicrobial effects and stimulatIon of the Reticulo Endothelial system.
Swarna Bindu Prashana is an Ayurvedic technique to improve immunity in children. It is a method of administering gold calx (Swarna Bhasma) in very minute quantities to improve immunity, strength, memory and intelligence in children. The original reference for this technique is mentioned in Kashyapa Samhita.
I am giving this dose daily to my kid from 1+ year age.
If you look at the Kashyapa’s verse given above, the Swarna (gold) administration is advised on daily basis for one month to up to six months. Pushya Nakshatra day is nowhere mentioned.
Administering it in Pushya Nakshatra day is derived by the Ayurvedic centers.
This day is given lot of significance in Ayurveda. This day is told as good for collection of medicinal herbs for medicine preparation.
Hence, there is no harm in administering it during Pushya Nakshatra day.
http://easyayurveda.com/2015/03/05/swarna-bindu-prashana/
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3131772/