Vitamin B-6 overdose risk in the Hinz Protocol (a.k.a. Amino Acid Therapy)

This is directed at several folks on this forum who are following the Amino Acid therapy of Dr. Hinz for PD. It recommends a daily dose of 300-600 mg of vitamin B-6. But this is risky. It exceeds the Tolerable Upper Intake Value (UL) of B-6, which is

100 mg/d for adults over 50. With chronic doses above this limit, one runs the risk of neuropathy (nerve damage).

So far, knock on wood, I have avoided the burning or tingling sensations that signal neuropathy, but what woke me up is a blood test ordered by my neurologist. They found my B-6 value is more than double the top value in the normal range (20-125 nmol/L). You can bet I will immediately cut back on this vitamin! (But, for now, I plan to continue following the rest of the Protocol.)

If you know anyone on the Hinz protocol for PD, please urge them to at least have their B-6 level tested. You may save them a heap of trouble.

35 Replies

  • How is the amino acid protocol going, are you getting results?

  • Yes, it works well . . . when I bother to follow it. (Getting out my applesauce and digital scale, measuring out the right quantities of powder, and so forth, is a 10-15 minute nuisance.) If I avoid eating protein with it--as a vegetarian, I am fond of snacking on nuts--it takes about 90 minutes to kick-in and then I have 2 blissful hours without the darned tremors, which at present are my most troubling symptom. I also try to eat healthy and work out at the gym 2-3 times per week.

    By the way, contrary to some deceitful adverts I have seen online, I do not at all believe the protocol is a cure for the disease. The underlying disease still gradually progresses, but hopefully minus all the dreadful symptoms/side effects commonly attributed to the powerful PD drugs.

  • Where can the protocol be found?


  • look at old posts &reply to #harleybob08

  • There is not a one-size-fits-all prescription. The doses of mucuna, tyrosine, etc., must be customized by a skilled provider.

  • If you read the writings carefully nowhere is anyone claiming a cure. The only ones claiming a cure are the hear-say people that really don't know what they are talking about, such as those found in this blog.

  • What is the cost of the supplements for this program? Has it effected your kidney function at all? Do you get that monitored on a regular basis with your doctor?

  • Cost about $500-$800 per month. Have not checked kidney function--no concern in this area was expressed by anyone. The supplements are all G.R.A.S. (generally regarded as safe).

  • It is because you are using the wrong kind of B6. Pyrodoxine is toxic in high levels. You need to take P-5-P which is the coenzyme of B6 which is not toxic at all. Pyridoxal phosphate, the active form of vitamin B₆, is a coenzyme and it the correct form.

  • Thank you for the insight. In fact, I have been using P-5-P. Tables of Upper Intake Levels (UL) do not distinguish between the several forms of vitamin B-6. Presumably P-5-P , the active form of B-6, is the one floating in our blood, regardless of which type you ingest. it is concerning that my blood serum levels of B-6 were so far above normal.

    " Answers


    Is P-5-P really better than "regular" vitamin B6?


    Pyridoxal-5-phosphate, sometimes called P-5-P or PLP, is the active form of vitamin B6 (pyridoxine). Most supplements provide the pyridoxine form of B6, although some provide pyridoxal-5-phosphate, or a combination of both. Taken at recommended doses, both forms appear to be relatively safe and have similar bioavailability for most people. Although pyridoxal-5-phosphate is sometimes promoted as more beneficial for people with diabetes, there do not appear to be any studies in people to support this.


  • Incorrect. As I stated. Pyrodoxine (the normally sold b6) is toxic in elevated dosages. P-5-P is not and can be used safely at the levels recommended in amino acid protocol.

  • I am happy to hear that, but can you cite a reputable source backing up your assertion? Consumer Lab knows vitamins very well and as you see all they can testify is that "both forms (of B6) appear to be relatively safe." I'd rather look before I leap :)

  • Please post some peer-reviewed literature to back up you toxicity claims. As far as I know there is none in the world, only urban legends like you are trying to promote.

  • I do not use the Hinz protocol, mainly because I require carbidopa in a 1:4 ratio with levodopa for the levodopa to exert its full effect. One misleading statement Hinz makes is that carbidopa has the sole FDA approval for reducing nausea caused by levodopa (hence the name of the combination of carbidopa/levodopa = sin - emet = without vomit). Although true, the fact is that carbidopa also increases the amount of levodopa that gets into the brain by inhibiting the breakdown of levodopa in the blood. I do not get any nausea any more, so l could take pure levodopa with no problem, but when I tried to reduce from C/L 25/100mg to 10/100mg the reduced carbidopa pills had very little effect and left me frozen. So, while carbidopa is approved only for reducing nausea, it has the more important effect of boosting the effective levodopa dose you take. Hinz constantly makes that misleading statement, and that may be because patients might demand some carbidopa with all those many bottles of mucuna powder (levodopa) they have to take. I take 50mg of B6 per day and alternate days with 50 mg of P5P, (pyaridoxal-5-phosphate, an activated form of B6), in case Hinz is right about carbidopa's inhibitory effect on B6. I also take 1000 mcg of B-12 (methyl-cobalamine not cyano -cobalamine which contains trace cyanide) because levodopa increases a toxic waste amino acid called homocysteine. Sure enough, mine was elevated, so I started the B12, which brought down my homocysteine to normal but I did develop mild peripheral neuropathy in the feet (reduced vibratory sense), a consequence of hyperhomocysteinemia. Never again!

  • Hi. I'm new to this forum and I am curious about your B6 intake. I've done a lot of reading about PD and carbidopa/levodopa, (my dad has PD) and it is my understanding that B6 blocks the effectiveness of L-dopa. The fact that carbidopa binds to B6 and deactivates it is one of the ways it helps L-dopa cross the blood/brain barrier. It is a real problem that so many things seem to interfere with L-dopa working as we need it to -- B6, protein, dairy, too much food in the stomach, etc., and I feel that is the reason my dad's Sinemet seems to work sometimes, but not so much others. But I do have concerns that the carbidopa is depleting his B6. I have lately been giving him 25mg of B6 at night, but I am afraid that it's just one more thing that may inhibit the L-dopa and cause him not to respond well to the medicine. I know that B6 is readily available in food, but neither those sources nor the supplements will help if the carbidopa is blocking it anyway. What are your (and dumpelkin's) thoughts on this, and have you noticed any difference in how you respond to your c/l since you've begun your B6 regiment?

  • good points, but it is probably dangerous to deplete b6 so i separate the b6 from c/l doses and pray!

  • This one takes the cake, B6 is required to metabolize L-dopa to dopamine. A central problem with Parkinson is inadequate dopamine levels. This non-expert is claiming the B6 blocks L-dopa. There is a reason you need to read peer-reviewed journals for basic science information. They may not be perfect but at least the science is not made up like it is in these blogs. B6 binding of carbidopa has nothing to do with L-dopa movement across the blood brain barrier which it freely crosses. Instead of being afraid find a doctor that knows what he is doing and get care. There is no way you will be able to treat your dad.

  • I guess you are a doctor. My husband suffers from PD and we have been trying to get a doctor qho can treat him following Dr. Hinz'z protocol in Spain or via Skype. Could you suggest me any doctor for us? Thanks alot.

  • Hi, I just came off of the Hinz protocol and what you say about Carbidopa is true. He never tells or mentions the absorption issue..

  • This mirrors my own observations including the peripheral neuropathy in my feet. Is that irreversible?

  • Neuropathy runs the gamut from reversible to irreversible:

    You should see a doctor about this as soon as possible to track down the cause and seek a therapy, if one exists.

  • Too bad you don't know as much about physician care of Parkinson disease as you think your do. Comments like yours only hurt people getting care from licensed physicians. The Hinz protocol is very complex. Anyone who tries to self treat has a fool for a patient and an idiot for a doctor.

  • Hi Parkinsondoc, I appreciate your numerous comments. But it is usually not obvious to whom they are addressed. The way the system is set up, *several* people in the thread may receive an alert that you have replied to them. If you are just scattershooting for benefit of the collective, well and good. But if you are actually addressing someone in particular, it will greatly focus your messages, if you preface each one with the name of the relevant party . . . such as "Hi dumpelkin, . . ." Then those who are targeted will perk up their ears and pay attention. They may even reply.

  • Thank you for the perceptive comment. I was also perplexed that Hinz did not mention carbidopa's effect of reducing the amount of L-Dopa needed. Dismissed it, not as deliberate deception or incompetence, but as an author's prerogative to emphasize what is most pertinent to his argument. Besides, the two benefits of carbidopa are almost the same thing since nausea is a byproduct of taking the large doses of L-Dopa needed when there is no carbidopa (or other DDC inhibitor) included. Am not sure whether taking B6 is the right way to compensate for the B6-binding effect of carbidopa--for all I know, they may mutually bind and render each other inoperative! But as a medical ignoramus, what do I know? (By the way, for reference , it might be worthwhile to point out that Dr. Hinz says that one mg of carbidopa binds with one mg of B6. So if, e.g., you are taking three 25/100 Sinemets per day, you'll need at least 75 mg of B6 to compensate.)

  • To address your point about B6 binding carbidopa - maybe that is why my offs are worse, but I figure take the B6 once a day separated from carbidopa so the peak serum levels do not coincide. and hope!

  • If you read the Hinz papers the fine points of carbidopa in Parkinson's disease are not discussed because it is not being used in the protocol.

  • New to the site. My mom has struggled with PD for about 15 years and is pretty progressed. Her neurologist said on a 0-5 progression scale she is a 3. After 12 years on sinemet, she went off from it completely in July 2016 and started on the Hinz protocol managed by a naturopath in Texas. No real drastic improvement in symptoms, but happy to see her off from carbidopa r/t the above mentioned B6 depletion. I feel I am noticing increasing confusion/disorientation and just so recently hallucinations. The confusion is not new, but increased since going on this protocol and the hallucinations are DEFINITELY a new symptom. She is on 28 grams daily in 3 divided doses. The nausea was poorly controlled in the beginning, but well controlled now.

    She has been getting IV chelation (DMPS and EDTA) since April, 2015 related to toxic levels of mercury, cadmium, arsenic, lead, tin and aluminum, I think this has shown very mild improvement in mobility.

    She had a positive stool sample for H. pylori, treated with mastic gum, grapefruit seed extract, pyloricin HCL.

    The real struggle with her symptoms are: bloating, anxiety/depression, insomnia, constipation, urinary incontinence. And we have seen little relief, if any with these after regimens such as probiotics, natural antimicrobials, many, many supplements (currently)--omega, melatonin, magnesium, curapro(curacumin), lithiume, DHEA, P5P, B6 complex, CoQ10 (ubiquinol), glutathione, natokinase, zinc, and many more over the years.

    Alas, she tested positive for Lyme this week. Looking into: rife machines, cat's claw, IV vit. C, IV ozone.

    Would appreciate general insight, especially related to effective Lyme treatments and hallucinations and confusion related to Hinz protocol. She was one 5 - 25/100 C/L, 3 times daily (total 15 per day) at time of discontinuation. Is 28G overdosing her dopamine? Her chelation Dr. told us of a man that was dosing himself with macuna and went schizophrenic....

  • It's been year or two since I read the relevant Hinz paper and I have forgotten a lot of the details. So please excuse me if I am a bit vague. But a skilled provider can and should do a "pill stop" with your mom, whereby the meds are stopped for a day or so. This is associated with urinary assays which look at the amounts of dopamine and serotonin excreted in the urine. Based on very extensive patient records, there is an ideal range of these excreted metabolites specified by Hinz et al. Also, if stopping the meds leads to an improvement/deterioration in symptoms , this, together with the urine assay, will point toward a calibrated change in the dosage of Mucuna. With a few pill stops, a knowledgeable provider should be able to zero in on an ideal dosage. The whole adjustment process may take several weeks or more. (I have never done a pill stop myself, but i have had about 2-3 urinary assays.)

  • I never take more than one 50 mg tablet per day of b6 or p5p so I am way below the TUL

    but thanks for the good reminder!

  • Well good for you, you obviously do not have Parkinson's or any other disease relating to inadequate levels of centrally acting monoamines. I am missing the point why you shared this.

  • OMG. I have been taking waaaay too much. I'm so grateful for your post.

  • Dear Beckey,

    I do not want to throw a curve ball, but my opinion has changed. Shortly after I posted this, I talked with my nauropath, Dr. Chad Oler, who, in my opinion, evinces a deep understanding of the Hinz protocol. He explained that the vitamin B6 is necessary in megadoses for the proper functioning of the protocol. His patients take up to 600 mg per day (per dose??) with no ill effects. I defer to his expertise. Ever since, I have continued to take 200 mg per day, marginally less than the 300 mg that was prescribed initially by Dr. Alvin Stein. So far, so good: no neuropathy. If it should rear its ugly head, I will have to reconsider. What kind of dose were you taking?

  • I took three 250-mg capsules. Yikes! Too much by any measure. I think I'll lay off for a bit then start in again at a lower dose. I watched a talk that had been streamed at the PD World Congress by a neuro from, I think, U of Florida. He said several non-pharmaceutical supplements that were believed to curb PD symptoms didn't pan out when studied but that B6 did work.

  • I would totally trust Dr oler and the late great dr stein with their protocol advice

  • Amen to that! They know/knew their stuff.

You may also like...