Home > Health, Studies, Supps & Pharmaceuticals > Scientific Studies > The Anti-cortisol Effects Of Niacinamide

The Anti-cortisol Effects Of Niacinamide

  1. This is yet another confirmation of my suspicion that sedative substances lower cortisol levels. Niacinamide is officially recognized as a GABA-A agonist, but apparently this is not the major reason behind its effect on cortisol. The enzyme that de-activates cortisol - 11b-HSD2 - is apparently an NAD-dependent enzyme. On the other hand, the enzyme that converts cortisone into the active cortisol - 11b-HSD1 - is apperently sensitive to inhibtion by agents that are structurally similar to niacinamide.
    So, I has the thought that niacinamide would make the perfect anti-cortisol compound since it may be capable of BOTH inhibiting 11b-HSD1 and enhancing 11b-HSD2, thus BOTH inhibiting cortisol synthesis and enhancing its de-activation. Separately, inhibitors of 11b-HSD1 and enhancers of 11b-HSD2 are in clinical trials for a number of conditions associated with hypercortisolemia.
    After doing some more research, I found out that I am not the only one having these thoughts. In fact, the pharma company AstraZeneca has synthesized and patented (with very little publicity and fanfare) several derivatives of niacinamide that can directly inhibit 11b-HSD1 and has enrolled them in clinical trials for a number of conditions related to high cortisol including Cushing syndrome, diabetes, obesity, etc.
    I exchanged some emails with the lead author of these studies and he admitted that niacinamide may indeed inhibit 11b-HSD1 (by binding to it) and definitely will enhance 11b-HSD2 (by raising NAD levels).
    There is not much data on in vivo effective doses by the in vitro EC50 for the niacinamide derivatives is in the micromolar range, which means as little as 100mg niacinamide should do the trick.

    Discovery of a potent, selective, and orally bioavailable acidic 11β-hydroxysteroid dehydrogenase type 1 (11β-HSD1) inhibitor: discovery of 2-[(3S)... - PubMed - NCBI

    "...11β-Hydroxysteroid dehydrogenase type 1 (11β-HSD1) is an NADPH dependent enzyme that is widely expressed, notably in liver, adipose tissue, and brain.10 It catalyzes the interconversion of the inactive glucocorticoid hormone cortisone (1) to the active glucocorticoid hormone cortisol (2) (Figure 1) and therefore plays a key role in the regulation of intracellular cortisol concentrations.11 11β-Hydroxysteroid dehydrogenase type 2 (11β-HSD2) is an NAD dependent oxidase expressed mainly in kidney and colon tissue that catalyzes the reverse reaction and prevents activation of mineralocorticoid receptors by 2.12 Inhibition of this enzyme has been associated with hypertension and other complications, and therefore, selectivity over this isoform is a key requirement for any potential therapeutic agent.13"

    "...Nicotinamide 4 had modest potency (IC50 = 350 nM) and was suprisingly unbound (rat plasma protein binding (PPB), 13.2% free) given the measured log D7.4 (3.2). Ligand efficiency was high as measured per heavy atom count (0.46) and moderate as measured by ligand lipophilicity efficiency30 (LLE = pIC50 − logD = 3.3). Sulfonamide 5 was more potent (IC50 = 200 nM) although less impressive in terms of ligand efficiency per heavy atom count (0.33) or ligand lipophilicity efficiency (2.8). The permeability of both was high as measured in a CACO-2 assay with no evidence of efflux."

    Nicotinamide uncouples hormone-dependent chromatin remodeling from transcription complex assembly. - PubMed - NCBI
    "...RT-PCR analysis of GR- and PR-regulated genes in the A1-2 cell line demonstrated that NAM also inhibits glucocorticoid dexamethasone (Dex)-induced GR-mediated transcription in addition to PR-mediated transcription (Fig. (Fig.1B1B)."

    A good synergy with niacinamide may be theanine and glycine, which also powerfully lower cortisol.
    Glycine Powerfully Lowers Cortisol | Ray Peat Forum
    Theanine Completely Abolishes The Cortisol Response To Stress In Humans | Ray Peat Forum
  2. find a patented way to do what niacinamide does, and charge insurance companies for it.
  3. Nice find :D
  4. What kind of niacin to use and what dosage? Link me on Amazon.
  5. Check out toxinless.com and see @Dan Wich's comparison of different brands. He links to Amazon.

    I vaguely recall Peat speaking about 50mg a day? Correct me anyone if I am wrong. I use 500mg once or twice a week.
  6. Would taking niacin be enough to significantly lower serotonin?
  7. Putfot I don't know about serotonin, but ray reccomends niacinamide,and not niacin.
  8. Thanks @paymanz! I forgot to make that distinction/correction. I use niacinimide.
  9. Ok. Thanks.
  10. 500mg once a week? Will a water soluble vitamins last in the body for weeks or excreted right away by the urine?
  11. Wondering how well nicotinamide riboside (have been taken 500mg/day for the last 3months) would be in lowering cortisol, it is a far better NAD+ enhancer than all the regular forms of vitamin b3 (though far more expensive).
    I've found nicotinamide riboside one of the only things you can actually 'feel'.
    Might trial with niacinamide in the future, only other form of vitamin b3 that I've used standalone was nicotinic acid, and used that pre-bed, definatly got the flush and enhanced sleep of it.
  12. many of us feel niacinamide/nicotinamide a LOT. Blood sugar tanks and it's pretty evident in dosages for me of over around 300mg.
  13. It take 3 g. niacinamide a day lately without problems. I eat small meals over the day. I think the niacinamide is helping my mood a lot.
  14. I personally have no experience with other forms of vitamin b3 other than nicotinicacid ( the flushing one ) pre-bed.
    Well besides my b-100 supp that I used in the past containing a fair amount, but that obviously had high dose of other b-vitamins in it aswell, so it would be impossible to track how much of an effect the vitamin b3 in it would have on me.
    Also @ecstatichamster, how do you dose your niacinamide, all at once? time of the day?
  15. Holy ***t 3grams, do you have high cholesterol?
    And arent you concerned about possible insulin resistance?
    Vitamin B3 - Scientific Review on Usage, Dosage, Side Effects | Examine.com
    Current evidence suggests prolonged niacin supplementation increases insulin resistance because it hinders the ability of insulin to suppress glucose synthesis in the liver. This causes an increase in blood glucose levels, which leads to lowered insulin sensitivity over time, since the relevant receptor is eventually desensitized to the elevated glucose levels in the blood.
  16. No. I'm not taking this much long term. Eventually plan to go down about half the dose.
  17. Even 1.5gram seems a whole lot, and i mean ALOT.
    Once again ill ask, what are you taking it for or trying to achieve?
  18. Reduce serotonin, cortisol, estrogen, phosphate, lactate, mild but annoying joint pain in wrist, improve mood, energy, metabolism, skin.
  19. It is not a lot. That is a therapeutic dose and is quite safe. As long as you aren't getting extremely cold from it.
  20. I experimented with 1.5gm day before yesterday and felt great tbt. In fact I think it reduced some inflammation and a slight discomfort sort of like reflux for about a week disappeared and has not returned. I took 1.5gm again this morning about an hour ago. Am watching...
  21. Still taking 3 g. day, occasionally up to 4 g. My right wrist is 95% better. I'm really happy.

    No side effects either.
  22. I took 4.5 grams for a few months; I noticed nothing but benefits.

    Doses above 3 grams should not be used for extended periods, as they can elevate liver enzymes.
  23. you can get it much cheaper at www.iherb.com - very low DHL rate + speedy delivery.

    Choose the reliable brands like Now Foods, Country Life, Jarrow Formulas, Source Naturals, Solaray, Solgar, Doctor's Best...

    Check out the niacinamide options here: Search - niacinamide - iHerb.com
  24. Looks like the names of some of the Vit B complex members have been confused. The link to the article at examine.com refers to Niacin, not Niacinamide. Vitamin B3 (= Niacin, = Nicotinic acid, the one that causes flushing, itching of skin). It can - at first - cause a rise in BG but it will eventually go back to normal, according to research findings. But, at examine.com, one reads:

    "Current evidence suggests prolonged niacin supplementation increases insulin resistance because it hinders the ability of insulin to suppress glucose synthesis in the liver. This causes an increase in blood glucose levels, which leads to lowered insulin sensitivity over time, since the relevant receptor is eventually desensitized to the elevated glucose levels in the blood..."

    Niacinamide (aka Nicotinamide, aka Nicotinic acid amide) is a derivative of Niacin (Niacin/Nicotinic acid + amide) and it does not cause flushing or itching. This is the one that RP recommends, primarily for lowering BG. You can refer to Haidut's explanation and clarification of its effect on T1DM & T2DM at:

    Niacinamide For Type II Diabetes
  25. A few months ago, I reduced my niacinamide dose to 500 - 1,500 mg day. Right wrist still hasn't become worse or anything.
  26. Any effect on BG?
  27. blood glucose? I haven't checked. Years ago, niacinamide would cause headaches and I'd have to eat a lot. But this more recent time of taking it, no problems at all.
  28. Could you pls check the BG parameter next time round and let us know the BG results as niacinamide specifically addresses the BG issue in the RP context. Your BG data will help us track its effectiveness in lowering BG as taught by RP. This is of course in addition to the unexpected result of reducing your wrist pain... via the inflammatory pathway (?)