Myo-inositol is a naturally occurring carbohydrate, historically called vitamin B8 although it is not a vitamin. It is a food supplement under FSAI and HPRA oversight in Ireland, not a medicine, and carries no authorised EU health claim. The strongest human evidence is in PCOS: a systematic review of 13 RCTs (Unfer et al., 2012, PMID 22296306) reported improvements in menstrual regularity, ovulation rate and hormonal markers at 4 g/day. Capsule products in Ireland provide 500 to 650 mg per capsule, well below that dose. This guide covers the myo vs d-chiro distinction, the 2025 EU ruling on d-chiro-inositol, dosage, capsules vs powder, side effects, the authorised choline claims, and compares the four inositol products stocked in Dublin. Reviewed 3 September 2026.

Whorwell et al. (University of Manchester, Am J Gastroenterol, 2006, PMID 16863564) demonstrated significant improvement in IBS composite symptom scores within 4 weeks using Bifidobacterium infantis 35624 at 1×10⁸ CFU/day, while Gionchetti et al. (Gastroenterology, 2000, PMID 10930365) measured 85% pouchitis remission maintenance at 9 months with the De Simone Formulation versus 6% in placebo — establishing the clearest published timing benchmarks for probiotic response in UK-relevant clinical populations. This Ireland evidence guide covers the signs probiotics are working by body system, how long probiotics take to work by use case (IBS, bloating, after antibiotics, women's health), signs they are not working, and features CDS22-formula (8 NCIMB strains, 450 billion CFU, €25.95 per 12-sachet pack, cold-chain delivered by Probiotic.ie) as the formulation with the deepest published evidence base available to Irish consumers.

Tursi et al. (Am J Gastroenterol, 2010, PMID 20517305) found the high-potency De Simone Formulation reduced ulcerative colitis activity by at least 50% in 57.7% of patients versus 39.7% on placebo (p=0.031), and the AGA 2024 pouchitis guideline (Barnes et al., Gastroenterology, 2024, PMID 38128971) states the evidence favouring probiotics for preventing pouchitis recurrence is limited to the De Simone Formulation. This Ireland evidence guide compares probiotic strains, CFU counts, clinical-grade versus everyday formulations, FSAI regulation, storage requirements and named products, Alflorex, Symprove, Optibac and CDS22-formula Probiotic (12 sachets, EUR 25.95), with nationwide tracked delivery from a temperature-controlled facility

Richie et al. (Penn State, Eur J Nutr, 2015, PMID 24791752) randomised 54 healthy adults to oral glutathione or placebo for 6 months and found 30 to 35% higher blood glutathione at 1,000 mg a day, while a 2019 systematic review (Dilokthornsakul et al., J Cosmet Dermatol, PMID 30895708) called the evidence for skin whitening inconclusive. This Ireland guide covers absorption, skin and liver evidence, glutathione vs NAC, forms, dosage, safety and FSAI status, with NOW Foods Glutathione 500mg and NOW Foods NAC 600mg stocked by Probiotic.ie in Dublin.

Birkeland et al. (Oslo University Hospital, European Journal of Clinical Nutrition, 2020, DOI: 10.1007/s00394-020-02282-5) confirmed in a randomised controlled trial that six weeks of inulin-type fructans produced a significant bifidogenic effect — selectively increasing Bifidobacterium abundance — and raised faecal SCFA concentrations including acetic and propionic acid, while Thompson et al. (University of Colorado Boulder, Frontiers in Behavioral Neuroscience, 2017, DOI: 10.3389/fnbeh.2016.00240) demonstrated improved NREM sleep consolidation and reduced stress-induced gut microbiome disruption in a prebiotic-fed animal model. This Ireland evidence guide covers inulin's mechanism of action as a prebiotic fibre (FOS/fructooligosaccharide), bifidogenic microbiome data, weight management and satiety research, sleep and gut-brain axis evidence, dosage guidance, side effects, foods high in inulin, and NOW Foods Certified Organic Inulin Powder (Blue Agave, 227g/445g, from €18.95 inc. 13.5% VAT) — available with nationwide tracked delivery from Dublin, regulated as a food supplement under FSAI guidelines.

Ziegler et al. (Deutsche Klinik für Diagnostik, Diabetologia, 1995, PMID 8786016) demonstrated in a 3-week multicentre RCT that intravenous alpha lipoic acid (600mg/day) significantly reduced diabetic neuropathy symptom scores vs placebo — the ALADIN trial — followed by the SYDNEY 2 oral RCT (Diabetes Care, 2006, PMID 17065669) confirming 600mg/day oral ALA significantly improved neuropathy symptoms (p<0.001) in 181 participants, establishing ALA as one of the most clinically studied antioxidant compounds in peripheral nerve research. This Ireland evidence guide covers alpha lipoic acid benefits, R-ALA vs racemic ALA, dosage, long-term evidence context (including Cochrane 2024), blood sugar and neuropathy trial data, skin research, safety and side effects, and Swanson Alpha Lipoic Acid 600mg 60 Capsules (€24.95, Irish VAT 13.5% included) — available with 1–2 business day tracked delivery from Dublin, regulated under FSAI food supplement guidelines.

Reid et al. (University of Western Ontario, FEMS Immunol Med Microbiol, 2003, PMID 12628548) demonstrated that oral administration of Lactobacillus rhamnosus GR-1 and Lactobacillus reuteri RC-14 demonstrated significant alteration of vaginal flora compared to placebo over 60 days (P=0.02), with 37% of women in the probiotic group showing restoration to normal lactobacilli-dominant microflora compared to 13% on placebo — establishing these strains as one of the most documented combinations in vaginal microbiome research. This Ireland evidence guide covers how probiotics work in the female body, strain selection by use case (gut, vaginal microbiome, daily general use), clinical evidence, dosage guidance, safety, and a verified comparison of four products available from Probiotic.ie — Optibac Intimate Flora For Women (€24.90), Swanson FemFlora (€18.45), NOW Women's Probiotic 20 Billion (€30.95), and Garden of Life Dr. Formulated Women's Probiotics 50B (€47.95) — with nationwide tracked delivery across Ireland.

Jacobsen et al. (Applied and Environmental Microbiology, 1999) confirmed that Lactobacillus rhamnosus Rosell-11 — the lead strain in Optibac Every Day — survives gastric transit and colonises the human gut, while Reid et al. (FEMS Immunology & Medical Microbiology, 2001, PMID 11376464) demonstrated that Lactobacillus rhamnosus GR-1 and Lactobacillus reuteri RC-14 — the two primary strains in Optibac For Women — transit orally to colonise the vaginal microbiome, backed by over 30 years of research and trials in more than 2,500 women. This Ireland guide covers both Optibac products available from Probiotic.ie — an authorised Optibac retailer in Ireland — comparing strains, CFU counts, clinical evidence, who each product suits, dosage, side effects, and a head-to-head comparison table; Optibac Every Day (30 capsules) and Optibac For Women (30 capsules) are available with nationwide tracked delivery across Ireland.

Schaffer et al. (University of South Alabama, J Biomed Sci, 2010, PMID 20804594) characterised taurine as a conditional essential nutrient synthesised from cysteine, with established roles in osmoregulation, bile acid conjugation, cardiac calcium flux, and antioxidant defence — EFSA identified 6 g/day as an observed safe adult intake level (EFSA Journal, 2012;10(6):2736). This Ireland evidence guide covers taurine's mechanism of action, cardiovascular trial data including Waldron et al. meta-analysis (2018), the Singh et al. ageing study (Science, 2023), energy drink comparisons, dosage guidance, safety and interactions, and NOW Foods Taurine 1000mg Double Strength (250 veg capsules, €29.95) — available with nationwide tracked delivery from Dublin, regulated under FSAI food supplement guidelines.

Yamadera et al. (Sleep and Biological Rhythms, 2007) found that 3 g of glycine ingested before bedtime significantly shortened latency to sleep onset (p = 0.01) and to slow wave sleep (p = 0.019) in polysomnographic measurements, while Bannai and Kawai (Journal of Pharmacological Sciences, 2012, Ajinomoto Co.) identified NMDA receptor activity in the suprachiasmatic nucleus as the proposed mechanism by which glycine is thought to lower core body temperature and support sleep onset. This Ireland evidence guide covers the glycine-for-sleep mechanism, RCT data from Yamadera et al. and Bannai et al., the GlyNAC longevity stack, collagen synthesis context, glycine versus magnesium glycinate explained, dosage guidance, and NOW Glycine 1000mg 100 Veg Capsules — available with nationwide Ireland delivery from Probiotic.ie.

Resveratrol, a polyphenol from Polygonum cuspidatum root — is proposed to modulate SIRT1 (Sirtuin-1), a NAD⁺-dependent deacetylase linked to cellular ageing pathways; Sinclair et al. (Harvard Medical School) identified SIRT1 pathway modulation as a key proposed mechanism in resveratrol longevity research. This Ireland evidence guide covers the SIRT1 mechanism, clinical trial data, NMN and pterostilbene stacking protocols, trans-resveratrol bioavailability, dosage guidance, and Swanson Resveratrol 250mg Higher Potency — available with next-day DPD delivery across Ireland.

Rhodiola rosea root contains rosavins and salidroside — compounds proposed to modulate the HPA axis stress response and support monoamine neurotransmitter pathways including serotonin and dopamine. A 2009 RCT by Olsson et al. (Planta Medica) found that standardised extract SHR-5 significantly reduced burnout fatigue after 28 days (p<0.05); this Ireland guide covers dosage, side effects, comparisons with ashwagandha, and where to buy Rhodiola rosea in Ireland.