Hello, the reason is because the proportion of wax is very high. It is recommended to reduce the proportion of wax, which is currently up to 75%, to about 15-35% (depending on the texture and hardness desired). Bitter taste, probably. Coming from
Double Glycerin if you want to use
Flavor mix, suggest to use binder
Water Balm which can help integrate water into the lip formula. And will help the texture of the lip smoother with it. More recommended for flavoring
Flavor will only give you the smell of the flavor. Usually, any form of sugar should be added to the recipe. To help it taste sweet, for example, use
Erythritol or Saccharin (not sold by the company) to achieve a sweet taste while getting smell from
Flavor that you use?