Cortisol is essential for normal function throughout life. It rises in the morning, tapers through the day, and can spike during training or stressful moments. That doesn't necessarily mean it's bad. The goal is to regulate cortisol across weeks, not to eliminate it. This blog expands on the key points discussed with Dr Chris McLellan, such as what cortisol is, what it’s doing in the body, when it matters most, and how to approach it without fear-based labels.
What is cortisol?
Cortisol is a hormone made by your adrenal glands, which sit on top of your kidneys. Your brain and pituitary gland help control how much is released. One of cortisol’s main jobs is helping your body respond to stress, whether that’s physical stress like training or mental stress like work pressure. It helps mobilise energy, keeps blood sugar stable, and prepares your body to handle whatever demand is in front of you.
Cortisol helps you:
- Mobilise energy when demand rises
- Support blood glucose control and metabolism so you can keep functioning
- Coordinate a stress response so you can handle what’s in front of you
So, if you’re awake, working, parenting, training, and making decisions, cortisol is involved.
Cortisol is built to change across the day
Healthy cortisol output follows a daily rhythm. In most people, cortisol is higher around waking and then gradually declines toward night.
A well-studied part of this is the cortisol awakening response, a rise across the first 30 to 45 minutes after waking. This rise is not a sign that something is “wrong”. It’s part of how the body prepares for the day.
When cortisol matters most
It’s easy to feel balanced when life is calm. It gets harder when the load starts to stack up:
- Late nights plus early alarms
- Back-to-back training sessions or big training weeks
- Work stress that follows you home
In those weeks, cortisol isn’t the issue by itself. The issue is a mismatch. For example, demand keeps climbing while recovery basics fall behind. When that happens, people often notice sleep disruption, low energy, reduced motivation to train, or feeling flat across sessions.
Training spikes are not automatically a problem
Exercise is a form of stress on the body. During training, cortisol can rise as part of a completely normal physiological response. That’s especially true during longer sessions or higher-intensity work.
The important distinction is this:
- Short-term increases are normal and part of how the body adapts.
- Problems tend to show up when stress stays elevated for long periods without enough recovery.
What not to expect
Don’t expect one supplement, one breathing drill, or one “cortisol protocol” to fix everything overnight. Because cortisol is a survival hormone. It affects almost every organ system and is tied into sleep-wake timing, metabolism, and stress responses.
Consistency beats urgency. If you have a heavy fortnight, the goal is not to remove stress. The goal is to keep the basics strong enough that your body can absorb the load.
Cortisol management without the noise
A simple way to think about it is this: match the demands you place on your body with strong foundations.
1) Make sleep a non-negotiable anchor
Cortisol is closely linked to your circadian rhythm, the internal clock that helps regulate your sleep-wake cycle. It naturally rises in the morning to help you wake up and gradually tapers off toward the evening.
Practical moves:
- Keep your wake-up time reasonably consistent most days.
- If training load is high, protect your bedtime routine the same way you protect your training sessions.
2) Fuel to match your week
Cortisol helps mobilise energy to meet the demands placed on your body. When training, work, and daily stress are high but food intake falls short, it can start to feel like your system is constantly “on alert.”
Practical moves:
- Don’t let busy days accidentally turn into low-fuel days.
- Build a repeatable default breakfast and post-training meal you can rely on.
3) Train with a recoverable volume
More is not always better when your life load is already high.
- If you are stacking stressful weeks, reduce volume first, not effort.
- Easy days should be active recovery or proper rest.
Active recovery or proper rest helps restore glycogen, reduce accumulated fatigue, and support tissue repair so the next hard session can be effective.
4) Use a simple rule you can stick to
If your weeks are stacked, make sleep and recovery the default before fatigue shows up.
That’s a regulation you can actually maintain.
When the foundations are in place, regulation becomes much more manageable. Sleep, nutrition, and training balance do most of the work.
Some people also choose to include supportive products alongside those basics. For example, products like BSc Zinc Magnesium Vitamin B6 are commonly used as part of an evening routine to support rest and recovery.
They’re not a shortcut or replacement for the fundamentals, but when the basics are consistent, they can sit alongside them as part of a broader recovery routine.
