I use it faithfully. It is well worth the money to me. It seems to help my muscles recover better
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I to am looking for Info on who's tried Malic acid. SO will keep up with this line of question.
I do not take Malic acid, but maybe one of the other members here do and can give you their thoughts about it.
Your second question is a tough one. Having FMS will make it difficult to distinguish between what is caused by FMS or what may be something else. If you are doing anything to exert your muscles and hurt afterwords (or can't move without pain the next day), it would prob. be FMS. If you fall, twist or anything that may have caused damage and have pain that does not subside over a few days, or have swelling and discoloration you prob. need to see a doctor.
Of course, there are many things that can upset muscles. Overuse, arthritis, osteoarthritis, gout, tendonitis...and the list goes on. So should you have unrelenting pain and know that you may have done something to cause an injury, it's best to seek a physicians help. Otherwise, if you are doing an activity and hurt a few hrs later or can't move the next day (lol) it's FMS.
Take care and hope this helps explain it a little better for you.