Green House Medical

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Therapeutic Cannabinoids


Medical Cannabis

Cannabis, and its active ingredients, cannabinoids, have been reported to have therapeutic effects in diseases such as cancer, epilepsy, autism, schizophrenia, depression, Alzheimer’s, Parkinson’s and Crohn’s disease, neuropathic pain, multiple sclerosis, migraine and many other disorders.

At GH Medical we aim to collect the available anecdotal evidence and where possible substantiate this with rigorous, science-based evidence. Hereto we will isolate each individual cannabinoid, test their biochemical and physiological function and most importantly their therapeutic potential, either alone or in combination with other cannabinoids. We will first test which cannabinoid (cocktail) most effectively reduces tumour growth. After that, we aim to tackle other diseases and disorders.



We have the world’s largest genetic library of cannabis strains including several unique landraces, which were obtained by the Strain Hunters on expeditions to the most remote regions of the world. These landraces are reported to have therapeutic properties but are mostly unknown to the general public and scientific world.


Analytic Testing

At the GH Medical laboratory we offer clients complete analytical testing for the usual contaminants that are found in cannabis, such as mould, fungus, bacteria, chemical residues, salts, remaining solvent and pesticides. In addition our lab offers full quantitative profiling of cannabinoids and other terpenes.


GH Medical is an initiative of the Strain Hunters Foundation and GHM Europe and is based in The Netherlands. Our activities include consulting, conducting scientific & medical research, product development, and quality control services. GH Medical provides governments and organisations in legally regulated cannabis industries the means to protect public health with advanced chemical testing.

our team


Heiko Hampsink

Chief Executive Officer

Heiko has been active in international business development for 2 decades. Inspired by the therapeutic potential of cannabinoids, Heiko founded GHM in 2014 as a research vehicle under Stichting Strain Hunters Foundation.

Dr. Joost Heeroma

Director of Science

Joost Heeroma, PhD, runs the Science Department at GHM. Joost is an expert in medical physiology, neurobiology and genetics. Joost has studied the genetic basis for disease for more than 15 years and now focuses on the endocannabinoid system and the vast therapeutic potential of cannabinoids.


Alberto Sainz

Science Manager

Alberto designs and runs scientific studies about the potential therapeutic effects of cannabis for GHM. He has a BSc in Psychology and an MSc in Neurobiology.

Joan Espel Grekopoulos

Research Scientist, Biochemistry

Joan is a multidisciplinary scientist in fields like biochemistry and biophysics, both from an experimental as well as from a theoretical point of view.


Daniel Sáez

Head of Cultivation

Daniel is an agro-environmental engineer, an expert on plant nutrition and genetic crop improvement with more than 10 years of experience in this field. He leads this department in Spain.