Comparative efficacy of Medhya Rasayana,Bacopa monnieri, and Centella asiatica in enhancing memory and IQ of 8-10 year-old healthy boys: A prakriti-based double-blind, randomized controlled trial.

The short version

This 90-day randomized trial with 180 boys compared two classical Ayurvedic memory herbs, Brahmi (Bacopa monnieri) and Mandookaparni (Centella asiatica, also known as Gotu Kola) head-to-head, using an individualized approach based on Ayurvedic constitution (Prakriti) — the framework describing a person's inborn balance of Vata, Pitta, and Kapha, the three governing principles Ayurveda uses to explain bodily and mental tendencies. Both herbs belong to a class Ayurveda calls Medhya Rasayana, or intellect-enhancers, traditionally used to support learning and memory since antiquity. Boys aged 8-10 with a clearly dominant Prakriti type were randomly assigned to receive either Brahmi or Mandookaparni as a traditional honey-and-ghee electuary, 20 grams daily for 90 days. Memory was measured with the PGI-CMS (a 10-part children's memory scale covering things like recall, attention, and recognition), and IQ was estimated with a drawing-based test, both given before and after the 90-day period. Both herbs meaningfully improved memory: the Brahmi group improved on 9 of 10 memory subsets and total memory score rose about 9% (p<0.01 throughout), while the Mandookaparni group improved on 8 subsets plus attention, with total memory score rising about 13% (p<0.01). Head-to-head, Mandookaparni edged out Brahmi on remote memory, delayed recall, visual recognition, and overall memory score. The advantage was strongest in boys with a Pitta-dominant constitution, where Mandookaparni outperformed Brahmi on nearly every measure, while Vata- and Kapha-constitution boys showed little difference between the two herbs. No side effects were reported with either treatment. The findings suggest both herbs are safe and effective memory-enhancers in healthy children, with Mandookaparni showing a possible edge in retaining and recalling older information. Because the trial compared the two herbs directly rather than against a placebo, it cannot say how much benefit either provides over no treatment at all. The single-center, boys-only design also means the results may not generalize to girls or other populations, and the authors call for larger, multi-site trials.

Key findings

• In a 90-day trial of 180 healthy boys aged 8-10, both Brahmi (Bacopa monnieri) and Mandookaparni (Centella asiatica, or Gotu Kola) produced statistically significant improvements in memory and IQ when taken daily as a traditional Ayurvedic electuary.
• Mandookaparni showed a modest but statistically significant edge over Brahmi in remote memory, delayed recall, visual recognition, and overall memory score, suggesting a particular strength in retaining and recalling older information.
• The advantage of Mandookaparni over Brahmi was most pronounced in children with a Pitta-dominant Ayurvedic constitution, while children with Vata- or Kapha-dominant constitutions showed little difference between the two herbs.
• Because the trial compared the two herbs against each other rather than against a placebo or no-treatment group, it demonstrates comparative effectiveness but cannot establish how much benefit either herb provides over natural improvement or no intervention.
• No adverse events were reported with either herb over the 90-day study period, in a sample of otherwise healthy children.

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