Cortisol is not the villain

Cortisol has become the most blamed molecule in wellness. It is held responsible for weight that will not shift, sleep that will not come, and a face that looks puffy in a photograph. Almost none of that survives contact with endocrinology.

It is worth setting out what cortisol actually is, because the category has built a great deal on top of a misunderstanding.

It is what gets you out of bed
Cortisol is not a stress toxin. It is a hormone that mobilizes energy, regulates blood pressure and immune activity, and follows a strong daily rhythm.

That rhythm is the point. Cortisol climbs sharply in the first thirty to forty five minutes after you wake, typically rising somewhere between 38 and 75 per cent above the level you woke with, then declines across the day to a low at night [1]. This is called the cortisol awakening response, and it is a sign of a functioning system rather than a malfunctioning one.

Which makes "lowering cortisol" a strange goal. Low cortisol at eight in the morning is not calm. It is a flat start to the day. What matters is the shape of the curve, not the size of the number, and almost nothing sold on the promise of reducing cortisol tells you at what hour it intends to do so.

Adrenal fatigue is not a diagnosis
The idea underneath much of the stress supplement category is that prolonged stress exhausts the adrenal glands until they can no longer produce enough cortisol.

A systematic review examined 58 studies looking for exactly that relationship and found no consistent correlation between fatigue states and cortisol levels. Its conclusion was that adrenal fatigue is not a real medical condition [2]. No endocrinology society recognises it. The Endocrine Society has issued a statement to that effect.

Related, and worth saying plainly: cortisol face is a social media invention. Genuine cortisol excess is Cushing's syndrome, which is uncommon, serious, and diagnosed by an endocrinologist through proper testing. It is not something to identify in a mirror, and if you are worried about it, the answer is a doctor rather than a supplement.

So what is left that is true
Quite a lot, but it is less dramatic than the marketing.

Stress is real, its effects on sleep, mood and concentration are real, and the nervous system has genuine nutritional requirements in order to function. That is the part with settled evidence behind it, and it is where the authorised claims sit.

Thiamine and vitamin B12 contribute to the normal functioning of the nervous system. Folate and vitamin B12 contribute to normal psychological function. Riboflavin, folate and vitamin B12 contribute to the reduction of tiredness and fatigue. These are not hedged marketing phrases. They are claims that have been assessed and permitted, and they describe requirements rather than effects.

That is why the four largest ingredients in Stress Less are B vitamins, not botanicals.

The botanicals sit alongside them, and several converge on the same target. GABA is the body's main inhibitory neurotransmitter, the signal that turns arousal down. Magnolia bark carries honokiol, which acts at the benzodiazepine site of the GABA-A receptor, and which in animal studies produced calming effects at doses well below those that cause sedation [3]. Green tea contributes L-theanine, long associated with a calm but alert state. Ashwagandha and lychee complete the formulation.

The point
You do not need to lower cortisol. You need a nervous system that is properly supplied and a rhythm that is not constantly disrupted.
Support, not suppression. It was never the villain.