It is recommended to use a concentration of 2.5% to begin with, and slowly build the concentration up to 5% and 10% after the skin has had time to develop a tolerance.
ແນະ ນໍາ ໃຫ້ໃຊ້ຄວາມເຂັ້ມຂົ້ນ 2.5% ເພື່ອເລີ່ມຕົ້ນ, ແລະຄ່ອຍໆສ້າງຄວາມເຂັ້ມຂົ້ນໃຫ້ສູງເຖິງ 5% ແລະ 10% ຫຼັງຈາກຜິວ ຫນັງ ມີເວລາທີ່ຈະພັດທະນາຄວາມອົດທົນ.