Lecithin 
Adjuvant : emulsifier · Livestock
A mixture of phospholipids extracted mainly from soya or sunflower, used in food as an emulsifier (E 322).
Characteristics
- Approved in the EU as a basic substance (Implementing Regulation (EU) 2015/1116).
- Its molecules sit between oil and water and hold the mixture together.
- Commercial lecithin-based adjuvants exist.
Role in the preparation: Emulsifier: lets a vegetable oil mix with the water of the preparation.
Caution: Prepare small amounts and use straight away, try it first on a few leaves and check local regulations before any use.
Sources: Règlement d'exécution (UE) 2015/1116 approuvant la substance de base « lécithines » · Loveland Products — Leci-Tech, adjuvant à base de lécithine (exemple commercial)
Documentary information: this is neither a recommendation for use nor a plant-protection or veterinary claim. Check your country's regulations before any use.