This is due to the varying nature of a biological product- sometimes the oil can be quite thick after mixing. If the environment is cool or it has been posted during the winter season, this may cause the oil to be too thick for the dropper. To fix this, please just pop the bottle in a cup of warm water for around 3 minutes until it softens up. If after doing so the issue still persists, please don’t hesitate to get back in contact with us. Warming the products slightly will not effect them.