Just a note to be mindful that we are all individuals with our own needs ...

Vitamin and mineral supplements of any kind should never be taken carelessly. Everyone's needs are unique to them and just because someone proclaims to have been cured by something does not mean that everyone should then jump on the band wagon and start taking it. Supplements are intended to provide additional support when necessary and according to the "individual needs of that person". There are many medications and health conditions that can be contradictory to consuming certain supplements and monosodium phosphate is on that list.

According to the Linus Pauling Institute:
Never exceed the recommended dietary allowance, or RDA, of phosphorus, or take more monosodium phosphate than prescribed without discussing it with your doctor. Ingesting too many phosphate supplements can prove toxic and lead to diarrhea and a hardening of your organs, and also can inhibit your body’s ability to absorb other essential minerals.

Additional Considerations according to Linus Pauling...

Monosodium phosphate and other phosphorus supplements can interact with several medications, so it is important to tell your doctor what else you take prior to ingesting the supplements. Seek medical attention if you experience any adverse reactions to your supplements, including dizziness, an irregular heart rate, confusion, muscle cramps, unusual thirst, decreased urination, or tiredness.