Good afternoon ,my question is if the 12.3 hemoglobin level not too low ?

No: Hemoglobin of 12.3 is normal for a women. Women have about 2.0 gm less hemoglobin than men, but manage to have the same oxygen carrying capacity by having higher levels of 2-3 DPG. For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex, if you have sex.