Hi Manal,
The amount and location of the mutation are both factors that affect how much hemoglobin is produced. In fact, this is the same reason some thals are major and some are intermedia, when both beta genes are mutated. Each of the two beta hemoglobin genes are responsible for producing equal amounts of hemoglobin. A person with a mild mutation might never even know they carried a thal gene, while someone with a thal beta zero gene might have significant symptoms or possibly be transfusion dependent. Unfortunately, there has been very little interest in researching minors and the variations found in the health of minors and its relationship to gene mutation. I think this information will be of more use with future treatments, where knowing the type of mutation each parent has will enable doctors to formulate a treatment program right from birth designed specifically for that combination of genes.
Any natural hemoglobin inducers such as wheatgrass (capsules or extract) or aloe, etc can be tried to raise your Hb. I am a great believer in maximizing the efficiency of the oxygen intake. Exercise, breathing deeply and vitamin E all can be of help in improving your oxygen efficiency. I have taken 400 IU of vitamin E daily for well over 30 years and feel that is very safe and very effective. Studies have also shown that almost all thal majors have severe deficiencies of vitamin E. I would postulate that minors would also show a deficiency to a lesser degree. The goal should not be just to show a higher Hb level, though. Many thals who use wheatgrass mention many positive effects including higher energy levels and less headaches and sickness, even though little or no improvement in Hb level takes place.