In this didactic monologue, Dr. A—an integrative/naturopathic physician with over 30 years of experience—explains how dietary tryptophan is processed in the body and brain, outlining its three major metabolic fates. First, tryptophan can be diverted to synthesize niacin (vitamin B3) when B3 levels are low, a backup pathway that prevents deficiency‑related psychiatric and physical symptoms. Second, when B3 is sufficient, tryptophan undergoes hydroxylation to 5‑HTP, which is then decarboxylated to serotonin, a key neurotransmitter for mood regulation. Third, serotonin is further converted to melatonin in the diencephalon, facilitating sleep onset and serving broader cellular roles as an antioxidant and mitochondrial stabilizer. The video discusses the practical implications of supplementing with L‑tryptophan versus 5‑HTP, emphasizing dose differences (hundreds‑to‑thousands mg for tryptophan, tens‑to‑low‑hundreds mg for 5‑HTP), timing (away from high‑protein meals to avoid transporter competition), and potential interactions with serotonergic medications (SSRIs, SNRIs). Dr. A cautions that excessive serotonin can arise from combined supplement and drug use, and advises consulting a qualified practitioner. The presentation concludes with a call to action for channel engagement.
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So we got questions about tryptophan and mood, sleep, and we've heard about taking tryptophan and getting some kind of benefit from it, but how does it work when it gets into your brain? That's what I want to break down right now. Hey there, it's Dr. A. I answer medical questions on this channel, and we've been doing that for quite a while now. I've been in the integrative and naturopathic medicine space teaching, writing, practicing, et cetera, for over 30 years, and I use this channel to share So the first thing is, is that tryptophan is an amino acid. And so an amino acid, as we've talked about with other amino acids, is the smallest constituent part of molecule anyway of a peptide. And if you put peptides together, you can make proteins and other things. So when we have an amino acid, the body can use it on its own and it can go through different processes with different enzymes to stick the amino acids together to make, say, a polypeptide or a protein. And your body does a lot of that with amino acids. But the other thing that the body does with amino acids is the use of them as what we would call biogenic amines or biogenic amino acids. And these can be used for, say, neurological purposes or nervous system regulatory purposes. Well, tryptophan, as you've probably heard, does a lot in the central nervous system and the peripheral nervous system. And its main fate in, as a biogenic amine, is to come in as dietary tryptophan from the Proteins that we eat, and then the protein gets broken down, and the tryptophan from the protein will go in. The body might use it for any number of things, but in the central nervous system, the body will take the tryptophan, and then it can go into one of two main pathways. Now, one pathway, which we would consider an accessory pathway, but it's very important for actual life, actually, is the accessory pathway, which gets turned on if our body gets low in vitamin B3 or niacin niacinamide. Niacinamide, the, that particular vitamin. And you might think, well, why would the central nervous system have a tryptophan backup pathway to make vitamin B3? Well, the first thing is that there's deficiency states that create a psychiatric and a physical manifestation. So our body does not like to be low on vitamin B3. And also, if we're getting low, we generally have enough tryptophan. We could borrow some and take it over and make niacinamide out of it. So the brain keeps saturated with niacinamide. But let's say we've got plenty of B3. around and now we don't need the accessory pathway. Where's the other pathway goes? Well, the other, the main pathway goes to 2 neurotransmitting substances that also do some other things that are very, very critical to your brain and other health. The first one is that the tryptophan from your diet gets hydroxylated and it becomes 5-HTP, which you can buy as a supplement. All you can buy tryptophan as a supplement. You can buy 5-HTP as a supplement. 5-HTP is the next step after tryptophan and it's Not quite there yet, but that's the intermediate 5-HTP. 5-HTP then is converted one more time and becomes the neurotransmitter serotonin. So we've heard of people, you know, needing serotonin. There are drugs that are serotonin reuptake inhibitors and serotonin transport manipulators and all sorts of serotonin drugs, right? Those are generally used for things such as depression and mood disorders, et cetera. Now, like any neurogenic amine or any neurotransmitter, you can always have too much serotonin, but you can have too little. But the part that sometimes gets left out is the pathway doesn't stop at serotonin. We make serotonin, but below serotonin, there's a couple more intermediate steps, and then we make another hormone called melatonin. And melatonin we think of for sleep, and certainly it is made for sleep inside of your brain, a place called the diencephalon in your brain. At night, as the lights go down, or at least in, in olden days when we didn't have nighttime lights, the eye would send signals back to The diencephalon part of your brain to say, okay, now take some of that serotonin, let's release the melatonin. Melatonin helps with the induction phase of sleeping. It doesn't keep you asleep, but it helps with the induction phase, makes you sleepy. But now in modern times, we've learned that melatonin also is used all over your body as a cell stabilizer. It's used as a mitochondrial stabilizer, as an antioxidant for the inside of your cells and all manner of other things. So it's It's not just that the melatonin will make you sleepy, which it does, but it's used elsewhere in your body to stabilize your cells in the redox setting. So we have one amino acid that has these 3 major ways it can go. In low vitamin B3 states, like niacin, niacinamide will steal the tryptophan and turn it into niacinamide. If we have enough B3, we have the other 2 fates where we run it through a hydroxylation process and make serotonin and then melatonin. So the main effects of people taking, say, tryptophan or 5-HTP are usually to try and balance their mood, to help maybe with minor depression, that sort of thing. They can be helpful for sleep because of both the melatonin and the serotonin portion of the tryptophan metabolism. And they can be helpful in the setting now in modern times that we know of being a substrate to make melatonin to help out with the antioxidant and stability of your cells. So there's lots and lots of ways that tryptophan or 5-HTP can be helpful. Now, people generally ask when they're asking about amino acid type therapies, are there any concerns we should have or cautions, you know, or dangers that we should observe? And that's certainly always a question that should be asked with any therapy that you do. So the first thing, as we said on the card in the beginning, this is not medical advice. This is just generally what we see in practice. And so you should get advice about the use of something like a neurogenic amine from a practitioner who does that sort of thing. But the cautions generally are If you are taking tryptophan separately from what you're eating, so if we eat proteins, there's going to be some tryptophan in the proteins. If we're taking therapeutic tryptophan or 5-HTP, the first thing to remember is the doses are very different. So when we're using tryptophan to help somebody, say with mood or something like that, the doses are going to be from, you know, 500 to 1,000 milligrams up multiple thousand milligrams. When we're using tryptophan as 5-HTP, remember it's a step down from tryptophan. 5-HTP doses are much, much lower. You would never take that high of a dose of 5-HTP because it is closer to being serotonin. So the first thing is know what you're taking. So if it's not from your diet, L-tryptophan as a supplement is going to be in hundreds to thousands of milligrams, and 5-HTP is going to be somewhere between 50 and hundreds of milligrams, right? The The safety part would be if you are taking serotonin drugs such as a selective serotonin reuptake inhibitor, SSRIs or SNRIs, or serotonin transport drugs or any, anything that says serotonin as part of the drug's mechanism, you should seek the advice of your prescriber before you go and take 5-HTP or tryptophan because they can have a collaborative effect. Sometimes that collaborative effect can be good and sometimes it can be too much serotonin. serotonin, which can happen if you have a drug already in your system that manipulates serotonin and then you add a whole bunch more, say tryptophan or 5-HTP, that your body wasn't expecting to happen. The final thing with dosing and administration is if you're trying to get a neurological or mood effect, you want to take your tryptophan away from other proteins because there's only so many amino acid transporters in your digestive tract. Now there's many, many millions of them, But there's only so many. And if I just eat a big high protein meal and then I take my supplemental 5-HTP or my tryptophan, it's in there competing with all of the other amino acids. And that's not going to end well. You're not going to get as much, not going to be as regular. We often have people take tryptophan like before dinner or bedtime because it does contribute a little bit more to the calming side of neurotransmission. Some people take it during the day just fine. Some, it doesn't work as well. But ideally, if you're going to take 5-HTP or tryptophan, it's better to take it away from food and take it with a glass of water or juice or something of that nature. All right. Well, I hope that answers the question about tryptophan and mood and how tryptophan turns into all these different things. And your brain has this wonderful way of working all that out. Thank you, all you subscribers. Please do like, share, subscribe, comment. It helps the channel. And if you haven't subscribed, please consider doing that. We'll see you on the next video. And while you're waiting, we'll put up some more videos here for you to take a look at. Thanks.
