For stress and cortisol
Ashwagandha · Plant Withania somnifera (ashwagandha)
Root extract studied for stress: −32.6% serum cortisol at 600 mg over 8 weeks (Salve 2019). Per sachet: 300 mg.
Helps with
In plain language
Ashwagandha is a herbal root extract, helps the body respond more gently to stress, without blocking it.
The active compounds act on the HPA axis (the system that manages the stress response).
Unlike sedatives, it does not “put the mind to sleep”, it regulates the stress reaction.
Natural source:
Root of the ashwagandha plant, a shrub native to India, North Africa and the Middle East. Used in Ayurvedic medicine for over 3,000 years. The root extract is concentrated — 1 kg of root yields roughly 30 g of extract.
Why ashwagandha is in Corti-Glow
When cortisol (the stress hormone) is high in the evening, you cannot fall asleep, you toss and turn, you think about work.
Salve 2019: intake of 600 mg over 8 weeks is associated with a −32.6% drop in serum cortisol (60 participants, randomized double-blind). The sachet has 300 mg — half the studied dose.
Ashwagandha root extract (Withania somnifera), used during periods of stress.
How it works on the body
The HPA axis — the stress system
Hypothalamus → pituitary → adrenal glands is the axis that tells the body “alarm” and raises cortisol. This is exactly the system in focus in the research on ashwagandha.
GABA — the calm neurotransmitter
GABA (gamma-aminobutyric acid) is the brain's “brake” in the evening — the feeling of being collected without drowsiness comes from there.
Evening cortisol and sleep
High cortisol in the evening is why you toss in bed. Salve 2019 measured a −32.6% drop in serum cortisol at 600 mg over 8 weeks; the sachet dose is 300 mg.
What to expect
First 3 days · Ashwagandha
A calmer evening mood. The inner “buzz” starts to quiet down.
First 3 days
A calmer evening mood. The inner “buzz” starts to quiet down.
1–2 weeks
You fall asleep more easily. Fewer 3 AM wake-ups.
4–6 weeks
Your stress reactions are gentler. Small things don't “shake” you as much.
8 weeks
Baseline cortisol has dropped. Energy is more stable all day long.
How it works with the other ingredients
Not random supplements in one box. Every combination has a biological reason.
Combination
+ L-Theanine · 200 mg
For calm focus without drowsiness
Mechanism
The two complement each other in time. L-Theanine works within 30–60 minutes (Kimura 2007: more alpha brain waves in 40 min), while ashwagandha is studied over the long term — Salve 2019: −32.6% serum cortisol at 600 mg over 8 weeks (300 mg in the sachet).
End benefit
Calm for tonight + less stress reactivity after a month.
3 combinations · click to explore
This is why they aren't sold separately, one sachet, the full chain.
The research
Salve et al. (2019)
Cureus
Participants
60 participants, randomized double-blind
Dosage
600 mg daily (300 mg twice), 8 weeks
Result: 32.6% reduction in serum cortisol at 600 mg (16.12 → 10.86 mcg/dL, p<0.0001). Significant reduction in perceived stress (PSS scale).
Chandrasekhar et al. (2012)
Indian Journal of Psychological Medicine
Participants
64 participants (mixed group)
Dosage
600 mg daily (300 mg twice), 60 days
Result: 27.9% reduction in serum cortisol. Significant improvement in perceived stress (on the standardized PSS scale) and quality of life.
Langade et al. (2019)
Cureus
Participants
58 participants with insomnia
Dosage
300 mg twice daily, 8 weeks
Result: Significant improvement in sleep quality (p<0.0001). Shorter sleep onset time, longer deep sleep.
Why this exact dose in Corti-Glow
See how our dose compares with what was used in clinical trials.
Corti-Glow, our dose
our dose, 300 mg
300 mg
Salve 2019
600 mg daily (300 mg twice), 8 weeks
600 mg
Chandrasekhar 2012
600 mg daily (300 mg twice), 60 days
600 mg
Langade 2019
300 mg twice daily, 8 weeks
300 mg
Frequently asked questions
Works well with
For calm focus without drowsiness
The green-tea amino acid. 200 mg per sachet — the dose used in clinical studies on calm focus.
See detailsFor sleep and muscle relaxation
Magnesium contributes to normal nervous system and muscle function. The bisglycinate form is chosen as gentler on the stomach than the oxide.
See details