Posted by Jimmyboy on October 28, 2007, at 20:00:58
In reply to Re: PB Big brains-) Tryptophan or 5-HTP ? F google :P, posted by Jimmyboy on October 28, 2007, at 19:09:04
Found the info I was trying to remember ..
A Word of Caution About
5-Hydroxytryptophan or 5-HTPTaken from the Life Extension Foundation newsletter
"The reasons for the potential risks of 5-HT were brought to our attention by Steven B Harris, M.D. He explained that: 5-Hydroxytryptophan (5-HT) is one step closer to serotonin than tryptophan. The sequence is as follows.
Tryptophan > 5-Hydroxytryptophan > Serotonin
Based on the above metabolic sequence it would appear desirable to use 5-HT instead of tryptophan since 5-HT more readily converts to serotonin. Serotonin is a neurotransmitter that is often deficient in the brains of depressed people. Boosting serotonin can alleviate depression in some people and reduce carbohydrate cravings in others, thus inducing weight loss.
Here's why 5-HT will not work for most Americans, and could be lethal to some people: The blood-brain barrier does not allow significant absorption of serotonin from the blood. The brain does have a large neutral amino acid pump that freely allows tryptophan and 5-HT into the brain for conversion into serotonin. The process by which 5-H is converted into serotonin is called decarboxylation. If decarboxylation occurs before 5-HT is absorbed by the brain, than blood levels of serotonin will elevate significantly, but very little serotonin will enter the brain.
When Europeans take 5-HT, they are often prescribed the dopa decarboxylase inhibitor carbidopa that prevents 5-HT from being converted into serotonin until it reaches the brain. Americans do not take carbidopa with 5-HT and the result is possible serotonin overload in the blood, with virtually no serotonin reaching the brain. We will describe later the dangers of overloading the blood with serotonin. Americans taking 5-HT are more vulnerable to blood serotonin overload because, unlike most Europeans who are vitamin deficient, Americans who use 5-HT usually take large doses of vitamin B6 as well. Vitamin B6 rapidly converts 5-HT into serotonin before it can reach the brain. Even when combined with carbidopa, high levels of vitamin B6 will break through the carbidopa barrier and insure that 5-HT converts into serotonin in the blood before the it can reach the brain.
The multiple health benefits of vitamin B6 are too important, we believe, to recommend that people avoid taking vitamin B6 just to enable them to try using 5-HT to boost brain serotonin levels. This may be difficult anyway without also taking carbidopa, which is available in the US only as a prescription drug. At the very best, those who take vitamin B6 with 5-HT are probably wasting their money. Unfortunately, high serotonin in the blood in not benign. Anyone suffering from heart disease should avoid 5-HT because the elevation in blood serotonin could cause coronary artery spasm an/or abnormal platelet aggregation, which are risk factors for sudden death heart attack.
Here is the real frightening aspect of serotonin overload, as described by Dr. Harris: "Serotonin causes not only harmless flushing and diarrhea, but people with serotonin secreting tumors (hindgut carcinoids) also have problems with fibrosis of the endocardium and valves of their right hearts with can cause heart failure. The effect can also be seen with dietary intake of only modest amounts of serotonin, and there has actually been described in the medical literature, a tribe of South Sea islanders with right heart fibrosis as a result of eating green banana mush, which poisons them with its serotonin content" Dr. Harris goes on to state that people who ingest several hundred milligrams a day of 5-HT with B6 and without a decarboxylase inhibitor would expect to see urinary excretion of a serotonin metabolite in the same range as a person with a serotonin secreting tumor.
Based upon Dr. Harris' report the Foundation had its analysts conduct an extensive review of the medical literature and have come to the following preliminary conclusions:
1) For 5-HT to boost serotonin levels in the brain it is necessary to: a)Take 50 mg of carbidopa before each 5-HT dose. Carbidopa is a prescription drug. b)Limit vitamin B6 supplementation to a small dose taken at least six hours before or after 5-HT carbidopa dosing. c) Have a urinary test to measure a metabolite of serotonin called 5-hydroxy indoleacetic acid (5-HIAA) on a regular basis. As long as 5-HIAA levels are normal, than 5-HT intake would be safe.
2) Those with existing cardiovascular disease, including atrial fibrillation, coronary artery disease, congestive heart failure, cardiomyopathy, valvular disease or pulmonary hypertension may want to avoid 5-HT completely. One Foundation analyst felt that 81 mg a day of aspirin and 500 mg a day of magnesium would reduce the risk of 5-HT inducing a heart attack.
3)The effects of 5-HT by itself elevating blood serotonin levels are extremely individualistic. Some people may not experience any blood serotonin increase, while others could suffer from a lethal serotonin peripheral overload.
4) Despite the potential dangers of 5-HT, most FDA-approved drugs to treat depression and obesity appear to be more toxic.
5) At the time of this printing, we have not been able to verify whether 5-HT induced serotonin overload would cause fibrosis of the aortic valve and destruction of the heart muscle. Based on the potential health risks of ingesting 5-HIT, Bio Recovery has decided not to offer it tat this time. we encourage anyone seeking to use 5-HT to follow strictly the above protocol for safe 5-HT supplementation. We'll post further evidence regarding 5-HTP as soon as it becomes available. This warning applies only to 5-hydroxy tryptophan (5-HT), not tryptophan itself. Published studies show that tryptophan does not readily convert into serotonin in the blood, but that 5-HT does, since 5-HT can convert directly into serotonin while tryptophan has to go through one additional metabolic step which protects against blood serotonin overload"
Sorry- kind of long, but may be useful
JB
poster:Jimmyboy
thread:791971
URL: http://www.dr-bob.org/babble/alter/20070923/msgs/792057.html