Raspberry leaves contain fragarine (a tonic for the uterus), tannins (likely responsible for the antinauseant, antivomiting, and astringent effects of this plant), polypeptides and ellagic acid. Also the leaves are a rich source of citrate of iron which is the alterative, blood-making, astringent, and contractile agent for the female’s reproductive area. Leaves are astringent, stimulant, digestive, tonic, alterative, parturient, hemostatic, anti-emetic, cathartic and antiseptic.
People born with the genetic condition phenylketonuria (PKU) are unable to metabolise the amino acid phenylalanine. Mental retardation and other severe disabilities can result. While dietary phenylalanine restriction prevents these problems, it also leads to low tyrosine levels in many (but not all) people with PKU. Tyrosine supplementation may be beneficial in some people with PKU, though the evidence is incomplete.
How much is usually taken?
Most people should not supplement with L-tyrosine. Some human research with people suffering from a variety of conditions used 100 mg per kilogram of body weight, equivalent to about seven grams per day for an average sized person. The appropriate amount to use in people with PKU is not known, therefore, the monitoring of blood levels by a physician is recommended.