Supplements may help but one need to improve the physical mechanisms to take in more oxygen to the blood so one do not pant with the slightest increase in effort.
In addition, the shortness of breath is also linked to weakness of other organs.
It is not getting in more oxygen to the extreme.
It is just getting a bit more than the current normal and gradually improve it further.
Since you are interested,
Try this to increase the time you can hold your breath.
Instead of pinching your nose, use the nails of your index and middle finger to block [softly but efficiently] from outside your the nostrils. This is more comfortable than pinching the nose. Point is to ensure there is no air going in when you hold your breath.
The procedure;
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In a normal situation without any exercise, just hold your breath and note the time.
If you are a beginner, the time is likely to be short, don’t bother about it. -
After a while from 1,
Do 15 deep breathes.
Use the diaphragmatic breathing technique. [you can google or YouTube for more details]
In this case, expand your stomach, then chest and then take in air up to your mouth.
Hold your breath [block with nails of index/middle finger] for a while 1-2-3 or 4 [which ever is comfortable] seconds to allow your lungs to absorb the oxygen.
Then slowly release the air till your stomach is lowered but do not blow out all the air completely, leave say 5-10%.
Do this for 15 times.
At the end of the 15th time, when your stomach is lowered to a comfortable position, block your nose with the nails of your index and middle finger and hold your breath until you feel discomfort and the urge to breathe. (It is critical, one should not try to force oneself to try to get a longer time].
Stop the time.
Then immediately take in a deep breath and hold it for 3-5-10 seconds [whichever you can] and then release.
It is likely you will be able to increase from the time you did in 1 above.
- Do procedure 2 for 3 Cycles.
The time you can hold your breath will increase each time, if not, don’t bother especially for a beginner.
Note the above is merely a preliminary exercise.
There are more adjustments to the above.
If you interested to go further, I can give you more procedures and notes.
It is reasonable that when one’s ability to hold one breath longer, and doing the above exercise, the overall constitution will improve thus the functions for all organs in the body to improve.
In any sudden flight or fight mode, that can easily be cooled down with a few breathing methods as above.
The full exercise above will help to modulate the long term f and f responses.