I've taken both Vitex and Propranolol. Didn't get any withdrawal symptoms from Vitex, but had a hard time with propranonol withdrawal with symptoms like jitters, head pressure and increased anxiety.
Vitex is a completely different story
Awesome herb and my best uplifter, but very short lived. It's a D2 dopamine and mu-opiate receptor activator
Iv'e took a drug with a low dose similar to Yours of a polish standarised extract:
Herbapol, Castagnus Mu-opiate receptor reference:
Activation of the mu-opiate receptor by Vitex agnus-castus methanol extracts: implication for its use in PMS.
Webster DE, Lu J, Chen SN, Farnsworth NR, Wang ZJ.
Department of Biopharmaceutical Sciences, College of Pharmacy, 833 South Woods Street, Room 335, University of Illinois, Chicago, IL 60612, USA.
The dried ripe fruit of Vitex agnus-castus L. (VAC) is widely used for the treatment of premenstrual syndrome (PMS). A previous study reported that extracts of VAC showed affinity to opiate receptors; however, functional activity was not determined. We tested two different VAC extracts in receptor binding and functional assays. Our objectives were: (1) to confirm the opiate affinity; (2) to rule out interference by free fatty acids (FFA); (3) to determine the mode of action of VAC at the mu-opiate receptor. Methanol extracts of VAC were prepared either before (VAC-M1) or after (VAC-M2) extraction with petroleum ether to remove fatty acids. Both extracts showed significant affinities to the mu-opiate receptor, as indicated by the concentration-dependent displacement of [3H]DAMGO binding in Chinese hamster ovary (CHO)-human mu-opiate receptor (hMOR) cells. The IC50 values were estimated to be 159.8 microg/ml (VAC-M1) and 69.5 microg/ml (VAC-M2). Since the defatted extract not only retained, but exhibited a higher affinity (p<0.001), it argued against significant interference by fatty acids. In an assay to determine receptor activation, VAC-M1 and VAC-M2 stimulated [35S]GTPgammaS binding by 41 and 61% (p<0.001), respectively. These results suggested for the first time that VAC acted as an agonist at the mu-opiate receptor, supporting its beneficial action in PMS.
The symptoms observed by me were: higher mood, a feeling that everything (including problems) is in right place, motivation, strong social anxiety decrease, feeling of comfort within my body, sometimes "mellow mood" at night, and on the first day a twilight sleep
Is't it a opiate symptom?
That was a semi subtle effect (dose 3 tablets of Castagnus), but definitely not placebo.. The effect diminishes ...or You get used to it with time. It lessens in approx. in 3-5 day's from my observations.
Many women with PCOS in Poland (where i live) are getting pregnant by using Vitex (some times alone). It lowers LH, increases dopamine, progesterone and activates mu-opiate. What is funny, is that some of the same effect's are observed while fasting (alone) -> LH lowering, progesterone increase, opioid activation etc. Fasting give's me some kind of Vitex/Opite high, maybe the 1/3 of it, but without the energy (dopamine kick?).
Fasting impairs LH secretion in female rats by activating an inhibitory opioid pathway.
Dyer RG, Mansfield S, Corbet H, Dean AD.
Two experiments were undertaken to investigate the way that fasting impairs LH secretion and to assess whether endogenous opioid mechanisms might be responsible for the impairment. In the first experiment, pulsatile LH secretion was measured in a total of 51 chronically ovariectomized female rats. Initially 29 rats were subjected to food withdrawal for 24, 48, 72 or 120 h before the experiment. When compared with data collected from eight unfasted control rats, the 120-h fast was found to reduce significantly the mean peak and trough values of the LH pulses measured. However, in a subsequent study, the inhibition of pulsatile LH secretion by a 120-h fast was prevented in a group of eight rats given the opioid antagonist naloxone hydrochloride before the start of the blood-sampling period. Naloxone was without effect on pulsatile LH secretion in eight unfasted control rats. In the second experiment, plasma LH concentrations were measured before and after unilateral electrical stimulation of the ventral noradrenergic tract (VNAT) in ovariectomized female rats pretreated with oestradiol benzoate. In 17 rats VNAT stimulation caused a significant rise in plasma LH, but after a 72-h fast this rise was significantly less than in unfasted control rats. However, pretreatment of fasted rats with naloxone (n = 9) significantly enhanced the VNAT-stimulated release of LH to the control values. Naloxone did not potentiate VNAT-stimulated LH release in unfasted animals (n = 6) or LH release in control unstimulated rats (n = 12). The experiments indicate that both pulsatile LH secretion, and LH release caused by VNAT stimulation, are impaired by an acute fast. (ABSTRACT TRUNCATED AT 250 WORDS)
I think this topic is getting more and more intersting
Edited by Raccoon, 23 April 2009 - 12:15 PM.