Kundalini Quartz, like other forms of Citrine, does not retain any negative energy. However, it still needs to be cleansed and most certainly charged up as it works on such deep levels. Only use this crystal on your self unless you are a fully qualified and practising crystal therapist. You MUST know what you’re doing if you want to activate Kundalini energy in someone else. Keep something nearby to ground with after using it and ensure you can eat and drink water after working with this crystal to calm both the physical and energetic body down.