Is a 6.5 to 6.9 cholesterol reading still safe to have and not take meds?

SI units: Most labs in the USA don't use SI units. In mg/dl, your cholesterol is:251-266. That raw number is of no value. You must break it down into LDL ("bad"), HDL ("good") and triglycerides to interpret it. Moreover, the cholesterol treatment is based on your overall risk status. Treatment would depend on whether you smoke, have HTN, diabetes, known atherosclerosis and your other med conditions.