L-phenylalanine (LPA) functions as a building block for the numerous proteins created by the body, and can be converted into other amino acids and chemical substances as well. It can be changed into phenylthylamine, a naturally occurring substance in the brain that is thought to promote mood, into L-tyrosine, and as a result, into L-dopa, epinephrine, and norepinephrine.
Another form of phenylalanine not typically found inside the body is D-phenylalanine (DPA). DPA is primarily converted into phenylethylamine, and cannot be changed into L-tyrosine, L-dopa, or norepinephrine. It is also possible that DPA has an influence over specific, pain controlling chemicals inside the brain.
Although the effectiveness of DLPA, a mixture of LPA and DPA, on rheumatoid arthritis has not yet been studied, DPA has proven beneficial in treating patients suffering from osteoarthritis, rheumatoid arthritis, and other forms of chronic pain. DPA may even be useful in treating patients suffering from Parkinson’s disease. Also, DLPA has been useful in treating depression.
by the Harvard School of Public Health
It has been asked by millions of people “If you eat a healthy diet, do you need to take vitamins?” Not very long ago, the common answer from most experts and professionals would have been an emphatic "no". However, today there's quite a bit of evidence that taking a daily multivitamin makes good sense for most adults.
by the Mayoclinic Staff
Given the popularity and availability of “high potency” amino acids, antioxidants, enzymes and herbs, it might seem like dietary supplements could replace food as a source of the nutrients the body requires. However, this is not the case.
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