What Is PMS and What Actually Helps?
Supplement Guide
PMS follows a predictable pattern in the body. Here's the short version, then the evidence behind it.
The Short Version
- PMS is not "just hormones." It's a hormone-gut-brain loop: falling oestrogen and progesterone lower the brain's two main calming chemicals, GABA and serotonin.
- 90% of your serotonin is made in the gut, so gut health has a direct line to PMS mood symptoms, not just digestion.
- A second gut system, the estrobolome, clears excess oestrogen. When it's sluggish, bloating and breast tenderness follow.
- Four things move the needle fastest: stable blood sugar, less caffeine and alcohol, calming amino acids (magnesium, L-theanine, glycine), and gut-targeted probiotics.
- REFIX combines all four at research-matched doses, once a day, in the evening.
What Is PMS, Exactly?
PMS describes physical and emotional symptoms that show up in the luteal phase, the one to two weeks between ovulation and your period, then ease once bleeding starts. Between 50% and 90% of women report at least one symptom, and 20% to 30% experience symptoms significant enough to disrupt daily life, according to a review published by the National Institutes of Health. A smaller group, roughly 1.6% to 8%, experience the more severe form, PMDD.
- Physical: bloating, breast tenderness, cramping, headaches, fatigue, food cravings
- Emotional: irritability, mood swings, anxiety, low mood, poor concentration, disrupted sleep
Worth Knowing
PMS is a measurable neurochemical event, not a mood you're expected to push through. Gut bacteria are directly involved in producing the neurotransmitters that dip during this window.
Why It Happens
As progesterone falls in the luteal phase, so does allopregnanolone, a metabolite that activates GABA receptors. Lower GABA activity tracks with the irritability and anxiety many women notice pre-period. Falling oestrogen lowers serotonin availability too, which is linked to low mood and cravings.
90%
The share of your body's serotonin made in the gut, not the brain. When the gut microbiome is out of balance, serotonin production and mood regulation during the luteal phase are affected.
There's a second gut connection specific to PMS: the estrobolome, the gut bacteria that metabolise and clear oestrogen. When it's out of balance, oestrogen clearance slows, which tracks with the bloating and breast tenderness that mark the physical side of PMS.
What Actually Helps
The daily basics
What each REFIX ingredient does for PMS
The ingredients with the strongest evidence work through two pathways: calming an overactive stress response, and supporting the gut systems that regulate serotonin and oestrogen clearance.
Eases irritability and anxiety
Magnesium Bisglycinate, 181mg
Blocks the NMDA receptor pathway behind stress reactivity. A meta-analysis found magnesium beneficially affects mood regulation, with PMS-specific research showing reduced irritability.
Steadies mood swings
L-Theanine, 200mg
A double-blind RCT found significant drops in irritability, anger and mood swings by the three-month mark. Promotes GABA without sedation.
Lowers stress, improves sleep
L-Glycine, 3,000mg
Clinical research shows a 19% reduction in subjective stress and improved sleep quality when taken before bed, addressing both ends of the mood-sleep loop.
Reduces anxiety and low mood
Chamomile + Lemon Balm
Both have PMS-specific RCTs: chamomile significantly reduced anxiety, low mood and irritability versus placebo; lemon balm improved quality of life over two cycles.
Eases bloating, supports hormone clearance
Probiotic Blend, 10 billion CFU
B. longum and L. reuteri target the estrobolome directly. Related strains reduced prolactin and inflammatory markers in PMS-specific research.
Feeds the beneficial bacteria
Inulin, 2,000mg
Prebiotic fibre that lets the probiotic strains above establish and persist. Microbiome shifts take four to eight weeks of consistent use.
| Ingredient | Research-Studied Range | REFIX Dose |
|---|---|---|
| Magnesium Bisglycinate | Studied in PMS populations for irritability and emotional symptoms | 181mg |
| L-Theanine | PMS trial dose showing significant mood benefit | 200mg |
| L-Glycine | 3g studied for stress reduction and sleep | 3,000mg |
| Chamomile Extract (12:1) | Studied at 250mg raw-equivalent for PMS mood symptoms | 50mg concentrated extract |
| Lemon Balm Extract (10:1) | Studied at 500mg raw-equivalent, twice daily | 80mg concentrated extract |
| Probiotic Blend | Strain-specific studies at 5 to 10 billion CFU | 10 billion CFU, two strains |
| Inulin | Typical effective prebiotic range | 2,000mg |
Chamomile and lemon balm are concentrated extracts. Extract ratios are not a direct substitute for the raw herb doses used in the cited studies; shown here for context on the ranges research has tested.
Frequently Asked Questions
How long before it starts working?
Magnesium, L-theanine and glycine can support the nervous system within days. Gut and hormone-related benefits take longer, roughly four to eight weeks of daily use, so give it two to three full cycles.
Is PMS the same as PMDD?
No. PMDD affects an estimated 1.6% to 8% of women, with symptoms severe enough to disrupt work or relationships. It's generally diagnosed by a healthcare professional. If symptoms feel unmanageable, speak to a GP.
Can gut health really affect mood before a period?
Yes. Around 90% of your serotonin is produced in the gut, and specific gut bacteria metabolise oestrogen through the estrobolome. Disruption to either system affects mood and physical symptoms.
Daily, or just before my period?
Daily. The gut microbiome changes linked to hormone metabolism build gradually, not in the days before a period. Taking it only in the luteal phase would miss most of the probiotic and prebiotic benefit.
The Bottom Line
PMS moves through the nervous system and the gut at the same time, which is why treating only mood or only bloating leaves half the pattern untouched. Stable blood sugar, less caffeine and alcohol, and consistent sleep set the foundation. Properly dosed magnesium, L-theanine, glycine, calming botanicals, targeted probiotics and prebiotic fibre address the mechanisms underneath.
Formulated with intention
Support your cycle without the guesswork
REFIX combines evidence-based doses of magnesium, L-theanine, glycine, calming botanicals and targeted probiotic strains in one evening formula, built around the gut-hormone connection behind PMS.
Third-party tested | No proprietary blends | About Alterv Health
This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before beginning any new supplement, particularly if symptoms are severe or you suspect PMDD.