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1. Remove the seeds and skin of the grapes while making your grape juice or other grape product. If you are doing this by hand, use a strainer.
2. Wash the filtered grape extracts thoroughly.
3. Set aside the extracted grape seeds and skin to dry for approximately 24 hours. During this time you can cook the seeds at a very low temperature, if desired. Cold pressing is an extraction process using minimal heat to extract oil out of seeds, so it is not an essential step to heat seeds, but it was a method used to extract more oil out of grape seeds when folks manually cold pressed at home. Heating the seeds slowly will also quicken the drying process.
4. Remove the excess oil and juices from the grape seeds and skin by adding the grape extracts to your cold press. Press the extracts until the oil shows a visible separation from the solids. Set aside, and in time the oil will separate from the extracts even further.
5. Skim the remaining oil from the solids.
6. Save the pressed oil and preserve it in bottles for both therapeutic and culinary uses.
7. Separate the grape seeds from the remaining skin solids.
8. Dry the separated extracts to make them ready for grinding.
9. Start grinding. Grind both the dried seeds and skins separately in a grinding appliance. Grind extracts until they form a fine powder. Combine the powdered seed extract with the powdered skin extract unless you prefer separate supplements of both seed and skin extract.
10. Fill individual empty gelatin capsules with your powdered mixture. Large-size capsules in size 00 are a good size to start with.
11. Preserve the capsules in a bottle and store in a cool location out of direct sunlight. Store powder in airtight bottles if you do not have gel caps.
https://www.leaf.tv/articles/how-to-make-grapeseed-extract/
In addition, these two sites are also useful.
http://www.grapeseedoilforskin.com/how-to-make-grapeseed-extract/
https://oureverydaylife.com/how-to-make-grapefruit-seed-extract-12171863.html
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