Like sildenafil (Viagra), Kaempferia Parviflora is a phosphodiesterase inhibitor. However, the effect is more gentle and requires prolonged use. Headaches are not much of a concern with this natural alternative. Please see a publication of the US NIH (National Institute of Health). Google: Kaempferia Parviflora Temkitthawon - Or visit: https://pubmed.ncbi.nlm.nih.gov/21884777/
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