There are many recipes on the internet for a homemade horse chestnut tincture or gel. For the tincture you usually only need horse chestnuts, alcohol and an airtight container. A vein gel, on the other hand, is somewhat more elaborate.
Those who are keen to experiment can make their own horse chestnut tincture or gel. For those who find this too time-consuming and laborious, there are a number of readily available products on the market.