Ingredient guide · Cortisol supplements

What’s Inside a Cortisol Supplement? Jevi’s Six Ingredients, Checked Against the Research

Ingredient guidePublished 5 October 202612 min read

Two people, same job, same bedtime. One is asleep by 10:30. The other is still replaying a 3pm meeting at 1am.

This guide explains what a cortisol supplement can and can’t do, then checks each of the six ingredients in Jevi Nervous System against the published research, dose by dose.

Trusted by 95,000+ customers

A jar of Jevi Nervous System beside ashwagandha root, saffron and fresh botanicals — Jevi Nervous System. Six ingredients, every dose printed on the label.

The short version

Jevi Nervous System is a daily formula: two capsules, six ingredients, every dose on the label.
Each ingredient has been studied on its own in human trials, mostly small ones in healthy adults, some of them selected for stress. The studies are listed at the bottom of this page.
No published trial of the finished formula was found. Keep that in mind as you read.
Three of the six doses match or sit close to the amounts studied. L-theanine is higher, the magnesium figure can’t be compared directly, and the probiotic blend has more bacteria but doesn’t name its strains.

Start here

What a Cortisol Supplement Can and Can’t Do

Both of them are running on a hormone with a daily clock. Cortisol, the one most people link with stress, is meant to be highest about half an hour after you wake and near its lowest by 11pm, so the body can wind down.

Meant to be high in the morning, low at night.

Illustrative, not to scale

A day with the pressure on can keep the stress response busy for longer than that. A lot of people describe what comes next in near-identical words: flat by mid-afternoon, then a brain that won’t switch off when the light goes out.

How a stressful day can carry into the night

1Long day with the pressure on
2stress response still busy at dinner
3harder to wind down at 10pm
4a broken night
5a foggy, shorter-fused morning
6the next day feels heavier

That’s a common pattern, and a pattern is all it is. Feeling stressed or sleeping badly doesn’t tell you your cortisol is high, and neither can a supplement. Only a test your doctor orders can do that.

So what does “cortisol support” on a supplement label mean? It describes what the ingredients were chosen for: helping the body handle everyday stress and keep healthy cortisol levels.† A supplement isn’t a treatment for a hormone condition. If you’re worried about one, start with your doctor.

A woman slumped on a sofa in the afternoon, hand on her forehead, a city skyline through the window

Meant to be high in the morning, low at night.

Illustrative, not to scale

If one bottle only helped a bit

Most people reading this have already tried something. A magnesium powder before bed. Melatonin. Ashwagandha on its own. One person in an online forum summed up a common result in three words:

“magnesium helps 7%.”

If that’s been you, nothing went wrong on your end. Each of those is one ingredient, studied for one job, and stress shows up in more than one place: tight shoulders at 5pm and a head still replaying the day at midnight.

“magnesium helps 7%.”

The formula

Jevi Nervous System: Six Ingredients, Two Capsules, Every Dose on the Label

Jevi Nervous System is a two-capsule daily formula from Jevi. Older reviews call it Corti-Help. Same formula, new name and label.

Jevi calls it a “6-pathway cortisol formula”, made for the nervous system, healthy cortisol levels and daily stress recovery “without knocking you out”.†

The part worth your time is the label. Two capsules hold six ingredients, each with its dose and a job printed beside it. There’s no hidden blend, so every dose can be held up against the research.

IngredientPer 2 capsules

Ashwagandha root extract(4% withanolides)
250 mg
Jevi’s job for itLong-Term Cortisol Support†
Psychobiotic probiotic blend(L. helveticus 7B CFU, B. longum 3B CFU)
10 billion CFU
Jevi’s job for itGut-Brain Stress Support†
Saffron extract(5% safranal)
30 mg
Jevi’s job for itMood Support†
Sceletium tortuosum extract(5% mesembrine-type alkaloids)
20 mg
Jevi’s job for itTakes the Edge Off Stress†
L-theanine
400 mg
Jevi’s job for itCalm Focus Without Drowsiness†
Magnesium glycinate
200 mg
Jevi’s job for itPhysical Tension and Wind-Down Support†

Per 2 capsules (daily serving). Other ingredient: vegetable cellulose capsule.

Two capsules once a day, ideally in the afternoon or early evening
Ingredients third-party lab tested†
Made in GMP-certified facilities
95,000+ customers
60-day money-back guarantee on your first order

Try it for 60 days

60-day money-back guarantee on your first order

The six ingredients

What Each Ingredient Has Been Studied For

None of the studies below tested Jevi Nervous System; they tested the ingredients one at a time. Each card shows who was studied, the dose next to Jevi’s, what changed, and the limits, including who paid: several trials were funded by, or used product from, the company that makes the extract.

Healthy cortisol levels

Ashwagandha root extract · 250 mg

Jevi’s job for it: Long-Term Cortisol Support†

What was studied. In an eight-week trial in India, 60 healthy adults with high scores on a perceived-stress questionnaire took 250 mg or 600 mg of a root extract a day, or a placebo.¹ Both ashwagandha groups reported lower stress scores than the placebo group, serum cortisol came down in both, and sleep quality ratings improved.¹ In a second trial, 60 stressed adults taking 240 mg a day of a different extract for 60 days had a bigger drop in morning cortisol than those on placebo.²

Dose check:

Jevi

250 mg

studied

250 mg¹

Same daily amount, different extract.

Worth knowing. Both trials used the extract maker’s own product: the first was supplied free by its manufacturer, the second was funded by the company that makes the extract. Jevi recommends checking with your doctor first if you have a thyroid condition, because adaptogens like ashwagandha may interact with thyroid function in some people.

The gut-brain connection

Psychobiotic probiotic blend · 10 billion CFU

Jevi’s job for it: Gut-Brain Stress Support†

What was studied. “Psychobiotic” is the word researchers use for probiotics studied for their effect on mood and stress through the gut-brain connection. The best-known human trial used the same two species Jevi uses. In France, 55 healthy volunteers took 3 billion CFU a day of two specific strains, L. helveticus R0052 and B. longum R0175, or a placebo, for 30 days.⁴ The probiotic group scored lower on questionnaires of psychological distress and had lower cortisol in a 24-hour urine sample.⁴

Dose check:

Jevi

10 billion CFU

studied

3 billion CFU⁴

More bacteria, but Jevi’s label doesn’t name the strains, and probiotic results belong to specific strains.

Worth knowing. One trial, 30 days, healthy volunteers. The probiotic was supplied by its manufacturer, Institut Rosell-Lallemand.

A steadier mood

Saffron extract · 30 mg

Jevi’s job for it: Mood Support†

What was studied. Two Australian trials used a standardised saffron extract at 28 mg a day. In the first, 128 healthy adults who reported low mood took it for four weeks; their mood scores improved more than with placebo, while a lower 22 mg dose made no difference.⁵ In the second, 63 adults with self-reported poor sleep took 14 mg twice a day for 28 days and rated their sleep quality higher than the placebo group.⁶

Dose check:

Jevi

30 mg

studied

28 mg⁵ ⁶

Close, different extract (the trials used one branded extract; Jevi’s is standardised to 5% safranal).

Worth knowing. Four weeks each, and people rated themselves. The second trial was funded by the extract’s maker, and the first had co-authors from it.

A calmer state

Sceletium tortuosum · 20 mg

Jevi’s job for it: Takes the Edge Off Stress†

What was studied. Sceletium is a South African plant with a long history of traditional use, and most human research uses one extract at 25 mg. In a brain-scan study, 16 healthy adults took a single 25 mg dose; afterwards the amygdala, the part of the brain that reacts to threatening faces, responded less than after placebo.⁷ A three-month safety study in 37 healthy adults found 8 mg and 25 mg a day both well tolerated.⁸

Dose check:

Jevi

20 mg

studied

25 mg⁷ ⁸

A little lower, different extract.

Worth knowing. Two small studies, one of them a single dose. Both tested the same branded extract, with an author from the company that supplies it.

Clearer focus

L-theanine · 400 mg

Jevi’s job for it: Calm Focus Without Drowsiness†

What was studied. L-theanine is an amino acid found in green tea. In a four-week crossover trial in Japan, 30 healthy adults took 200 mg a day or a placebo. On L-theanine, their scores for stress-related symptoms and for sleep quality improved, and so did two tests of verbal fluency and executive function.⁹

Dose check:

Jevi

400 mg

studied

200 mg⁹

Double; a higher dose than studied hasn’t been shown to do more.

Worth knowing. One trial of 30 people. The L-theanine and placebo tablets came from the manufacturer, and two of its employees co-authored the paper.

Nervous-system balance and wind-down

Magnesium glycinate · 200 mg

Jevi’s job for it: Physical Tension and Wind-Down Support†

What was studied. The research on magnesium and stress is thinner than its popularity suggests: a 2017 review of 18 studies called the evidence suggestive but of poor quality.¹⁰ In an eight-week trial of 264 stressed adults with low blood magnesium, stress scores fell by just over 40 per cent from where they started on about 300 mg of magnesium a day, as lactate, with or without vitamin B6.¹¹ With no placebo group, there’s no way to say how much of that was the magnesium.

Dose check:

Jevi

200 mg magnesium glycinate

studied

about 300 mg of magnesium¹¹

Not directly comparable: the trial counted magnesium itself, and Jevi’s label lists the glycinate without saying how much of it is magnesium.

Worth knowing. If you take magnesium already, add up your total and ask your pharmacist.

Dose check at a glance

Ashwagandha
Same amount, different extract
Jevi, per 2 capsules
250 mg
Studied dose
250 mg¹ (240 mg², 600 mg³)
Psychobiotic blend
More CFU, strains not named
Jevi, per 2 capsules
10 billion CFU
Studied dose
3 billion CFU⁴
Saffron
Close, different extract
Jevi, per 2 capsules
30 mg
Studied dose
28 mg⁵ ⁶
Sceletium
A little lower, different extract
Jevi, per 2 capsules
20 mg
Studied dose
25 mg⁷ ⁸
L-theanine
Double
Jevi, per 2 capsules
400 mg
Studied dose
200 mg⁹
Magnesium glycinate
Can’t compare: elemental figure not stated
Jevi, per 2 capsules
200 mg
Studied dose
about 300 mg magnesium¹¹

Ingredient	Jevi, per 2 capsules	Studied dose	How close
Ashwagandha	250 mg	250 mg¹ (240 mg², 600 mg³)	Same amount, different extract
Psychobiotic blend	10 billion CFU	3 billion CFU⁴	More CFU, strains not named
Saffron	30 mg	28 mg⁵ ⁶	Close, different extract
Sceletium	20 mg	25 mg⁷ ⁸	A little lower, different extract
L-theanine	400 mg	200 mg⁹	Double
Magnesium glycinate	200 mg	about 300 mg magnesium¹¹	Can’t compare: elemental figure not stated

Doses per day. Studied doses from the trials listed under Sources.

Why put six in one formula?

One Jevi customer, S, put the practical side in a line: “Saves on buying lots of different supplements.”

A trial of the six together, in these amounts, hasn’t been published. That’s what the 60-day guarantee is for.

Try it for 60 days

60-day money-back guarantee on your first order

In their own words

What Jevi Customers Write About It

“I’ve tried a few things no and most are snake oils but I gotta say, this stuff really works, no doubt about it…”
Scott MJevi customer
“It helps me with my sleep…”
FleurJevi customer
“I do find I am sleeping better and not waking up as frequently as I had been.”
DavidJevi customer
“Slept through the night. First time in years.”
VanessaVerified buyer

Jevi customers, as pictured on tryjevi.com

Individual experiences vary and results aren’t guaranteed.

Two capsules a daySix ingredients, every dose on the labelIngredients third-party lab testedTrusted by 95,000+ customers60-day money-back guarantee on your first orderShipped the next day

Before you buy

What to Check Before You Choose a Cortisol Supplement

Use this list on any product you’re looking at, Jevi included. Jevi’s answer sits beside each one.

What to check

Jevi Nervous System

1. Can you see every dose? A “proprietary blend” lists ingredients without amounts.
Jevi Nervous System: Every ingredient and its dose is on the label. No hidden blend.†
2. Are the extracts standardised? The percentage tells you how much of the active part you’re getting.
Jevi Nervous System: Ashwagandha 4% withanolides, saffron 5% safranal, sceletium 5% mesembrine-type alkaloids.
3. Do the doses line up with the research?
Jevi Nervous System: Three are the same or close. L-theanine is higher, the magnesium figure can’t be compared directly, and the probiotic strains aren’t named. See the dose check above.
4. Was the product tested, or only the ingredients?
Jevi Nervous System: The published research is on the ingredients. Jevi’s raw ingredients are third-party lab tested for purity, potency and quality,† and the capsules are made in GMP-certified facilities.
5. Will it make you drowsy at work?
Jevi Nervous System: Designed for calm “without knocking you out”.† L-theanine is listed for calm focus without drowsiness.†
6. Does it fit your day?
Jevi Nervous System: Two capsules once a day, ideally in the afternoon or early evening. Size 0, about 2 cm.
7. Is it right alongside what you already take?
Jevi Nervous System: Check with your doctor or pharmacist first if you take prescription medication for mood, have a thyroid condition, or are pregnant or breastfeeding.

What Jevi says to expect. It “isn’t a quick ‘calm hit’”.

1
Weeks 1 to 2:
some people notice early changes.†
2
After that, with daily use:
the deeper benefits build.†
3
Day 60:
the second bottle runs out, and so does the guarantee window on your first order.

Two things in the other column

This is a daily formula. It isn’t a one-night fix.

And it isn’t the cheapest thing on the shelf. Sarah, a Jevi customer, wrote: “Really helps. A little pricey but works.”

Try it for 60 days

60-day money-back guarantee on your first order

Two capsules tipped into a hand beside an open jar of Jevi Nervous System

Try it for 60 days

60-day money-back guarantee on your first order

The current offer

What It Costs on Jevi’s UK Store

The maths: £0.58 a day. Less than a takeaway coffee.

Jevi Nervous System

Six ingredients · every dose on the label · two capsules a day

60-day money-back guarantee on your first order: return the bottle within 60 days and Jevi refunds the full product price. Return postage and the original shipping are yours.
Shipped the next day.
Two bottles is 60 days of capsules, the same length as the guarantee.

Try it for 60 days

Choose 2 or 4 bottles on the next page · 60-day money-back guarantee on your first order

60-day money-back guarantee
Shipped the next day
2 capsules daily
Ingredients third-party lab tested

“This unfamiliar sense of calm and level-headedness was just there.”

Margaret, Verified buyer

Prices as listed on Jevi’s UK store on 5 October 2026. The store sets the offer and can change it.

Questions

What People Ask Before They Order

Has Jevi Nervous System itself been tested in a clinical trial?

No published trial of the finished formula was found. The studies on this page tested the ingredients one at a time. Jevi says its raw ingredients are third-party lab tested for purity, potency and quality,† and the capsules are made in GMP-certified facilities.

Can a supplement lower my cortisol?

No supplement can tell you what your cortisol is doing, and this one isn’t a treatment for anything. Its six ingredients were each studied on their own, in healthy adults, for things like stress scores, mood and sleep quality. Jevi Nervous System itself hasn’t been studied in a published trial. If you want to know your own levels, that’s a test your doctor orders.

I already take magnesium glycinate. Should I be taking something else with it?

Jevi Nervous System already has 200 mg of magnesium glycinate in it, so taking it next to a separate magnesium means doubling up. Add the two totals and check them with your pharmacist before you combine them.

Can I take it if I’m pregnant, breastfeeding or on medication?

Check with your doctor or pharmacist first if you’re pregnant or breastfeeding, take prescription medication for mood, or have a thyroid condition.

What if it doesn’t suit me?

Your first order is covered: return the bottle within 60 days for a full refund of the product price. Return postage and the original shipping are yours.

The bottom line

Comparing Cortisol Supplements? Start With the Label

What you get is a label you can check line by line, two capsules a day for £0.58, and 60 days on your first order to see how your days and nights feel.

Shop Jevi

2 bottles £34.99 · £0.58 a day · 60-day money-back guarantee on your first order

This article is promotional content for Jevi Nervous System.

Customer reviews as published on tryjevi.com and in Jevi’s verified-buyer reviews on Judge.me. Individual experiences vary and results are not guaranteed.

†This product is not intended to diagnose, treat, cure or prevent any disease. Always read the label and follow the directions for use. Individual results vary.

Studies cited tested individual ingredients. None tested Jevi Nervous System. Doses, extracts and study populations differ from the product as described on each card.

Prices as listed on Jevi’s UK store on 5 October 2026. The store sets the offer and can change it.

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CORTI-HELP STRESS & CORTISOL RELIEF

What’s Inside a Cortisol Supplement? Jevi’s Six Ingredients, Checked Against the Research

The short version

What a Cortisol Supplement Can and Can’t Do

If one bottle only helped a bit

Jevi Nervous System: Six Ingredients, Two Capsules, Every Dose on the Label

What Each Ingredient Has Been Studied For

Ashwagandha root extract · 250 mg

Psychobiotic probiotic blend · 10 billion CFU

Saffron extract · 30 mg

Sceletium tortuosum · 20 mg

L-theanine · 400 mg

Magnesium glycinate · 200 mg

Dose check at a glance

Why put six in one formula?

What Jevi Customers Write About It

What to Check Before You Choose a Cortisol Supplement

Two things in the other column

What It Costs on Jevi’s UK Store

Jevi Nervous System

What People Ask Before They Order

Comparing Cortisol Supplements? Start With the Label

Sources