Use at 5% to 8% of total volume.
Use caution with this product.
Add it to your eliquid carefully and follow the directions. There is a big difference between drinking a Coke or a can of Red Bull and adding e-caffeine to your e-liquid. Different delivery mechanisms to the blood stream means different volumes allowed.
Drinking caffeine in a Coke means the digestive tract is in play. The commonly used dosage here is no more than 500mg per day. But vaping is a completely different ballgame. 1mg per day vaped is considered a large dosage. Our 10ml bottle contains 4.26mg of caffeine, so tread lightly and start with small amounts only.
The best approach is to count drops.
1ml juice in tank = add 1 drop in your tank
3ml juice in tank = add 4 drops in your tank
10ml juice in tank = add 13 drops in your tank
To calculate any amount, take your ml of starting liquid x 1.25
If you think you have 5ml of starting liquid, for example, take that amount times 1.25 (5 x 1.25 = 6.25 drops to add).