Obtain a concentrated aqueous extract of the pumpkin seed. Use freeze drying to dehydrate and conserve. Container might be filled with nirgen gas to add the longevity.

Agree with Paul Reed Hepperly

Hi, Salwa,

You can make aqueous pumpkin seed extract in solid form as follows.

Pumpkin seed kernel (100 g) was milled and mixed with the addition of 300 ml distilled water at 40°C for 18 to 24 h. The obtained mixture was filtered and the liquid part (water) was evaporated by using a freeze dryer and pumpkin seed extract was obtained as pulverized.

Good luck.