Cycle syncing at work: What the science actually says about productivity

You’ve probably heard of "cycle syncing"- the idea of changing your diet, exercise, and daily routines to match which phase of your menstrual cycle you’re currently in.

Cycle syncing at work can sound particularly appealing, promising greater productivity and less burnout. But is there real science behind the trend? Or could it risk reinforcing the harmful idea that people with cycles are less reliable at work?

We’re separating the facts from the social media hype to explore what’s actually helpful and how self-awareness can support your career without adding more pressure.

We spoke with Dr. Cornelia Hainer, Director of Science at Clue, about the science behind "cycle syncing", its potential workplace benefits, and how to use cycle awareness as an empowering tool.

Key takeaways:

• Hormonal changes throughout the menstrual cycle can affect mood, energy, sleep, and focus, but individual experiences also depend on factors like stress, diet, and environment

• Hormonal changes may subtly affect cognition, but menstrual symptoms like pain, fatigue, and poor sleep are more likely to temporarily impact focus and productivity

• Tracking your cycle can help you identify personal patterns in motivation, creativity, and focus, allowing you to adapt your work flexibly

• Cycle syncing can be empowering when used for self-awareness, but becomes harmful when treated as a rigid rulebook for how you should work or behave based on your cycle phase

What causes energy and mood shifts during your menstrual cycle? 

Most women and people with cycles experience noticeable physical and emotional changes throughout the different phases of their cycle. What this feels like varies from person to person and even from cycle to cycle.

Fluctuations of estrogen and progesterone are the main reason for this. These hormones don’t just regulate the uterus and ovaries; they also interact with our neurotransmitters in the brain (like serotonin, GABA, and dopamine), influencing mood, sleep, energy, and other aspects of wellbeing.

That said, not every change in how you feel is caused by the hormonal fluctuations of your cycle. Day-to-day factors can also play a big role in shaping mood and energy, such as:

• Daily

• Sleep quality and sleep hygiene

• Diet and hydration

• Social environment and workload demands

Keeping track of your cycle and how you feel throughout is a good way to spot patterns in your mood, energy, or focus. Over time, this can help you understand how hormonal shifts might relate to how you feel and adapt your routines more closely to your own rhythms, rather than trying to push through or ignore them. 

Clue’s Cycle Phase Insights feature in the Analysis Tab helps uncover how hormonal changes may relate to your personal experiences. It offers real-time information on what’s happening hormonally at each phase of your cycle, and how this may influence mood, energy, focus, and other experiences. It also gives insights into common experiences from the Clue community.

How do different cycle phases affect energy and mood patterns?

While each person’s experience is unique, there are clear trends seen in both scientific research and Clue’s aggregated, anonymized community data. 

During the late follicular phase (after menstruation, leading up to ovulation), when estrogen is rising, many people report better mood, energy, and motivation. In Clue’s data, we see that "happy" is the most frequently tracked feeling during the late follicular phase.

During the luteal phase (after ovulation until the next period), when progesterone is higher, many report feeling more tired. High progesterone can also impact sleep quality, leading to restlessness or less refreshing sleep.

As hormone levels drop towards the end of the cycle, irritability and mood swings are common. A lot of Clue users track feeling "sensitive" around this time.

However, sensitivity to hormonal changes differs widely. Some people experience strong cyclical changes, while others may not notice any major changes across the cycle at all. Both of these experiences can be absolutely normal. 

Can where people are in their cycle affect cognitive capabilities that could have an impact on work?

Hormonal changes can influence aspects of cognition and performance, but not in ways that make people with cycles generally less capable. 

Research has found that estrogen and progesterone can affect brain shape and function, and how certain brain regions communicate, which can influence attention, memory, and emotional regulation. However, these effects are subtle, vary between individuals, and do not imply that overall performance rises or falls across the cycle. 

What’s more consistent is that symptoms like pain, fatigue, or mood changes—especially before and during the period—can temporarily affect focus and productivity.

A study in the British Medical Journal found that it’s these symptoms, not just the period itself, that tend to interfere with work and school productivity. 

Is it worth planning work schedules around different points in the menstrual cycle where possible? Could tracking our cycle and adapting to it potentially help boost productivity in the workplace?

For some people, yes. If you notice clear patterns in your motivation, creativity, or focus, aligning certain tasks with your cycle can make work feel smoother and increase productivity. 

 Tracking your cycle in Clue for at least three cycles can reveal those patterns. Many Clue users report feeling most motivated and creative in the follicular phase, especially right before ovulation. If the same is true for you, this can be a good time for brainstorming, important meetings, or high-energy collaboration. 

Some studies also suggest creativity peaks around ovulation. During the luteal phase, when progesterone is higher, individuals may be better suited to deep focus or more detail-oriented tasks.

This approach should not be about rigid optimization, which can be stress-inducing and can put people under pressure. It’s more about self-awareness and compassion. Planning with your cycle can help reduce the stress of being “caught off guard” by low energy, mood, or other cycle-related symptoms and can increase a sense of agency and well-being over your time.

Employers can support this by promoting menstrual health education, offering flexible work arrangements, and normalizing conversations about cycle-related needs. Workplace flexibility and supportive policies can help people manage menstrual symptoms without having to choose between their health and their work. 

Are trends like “cycle syncing” positive, or can they enforce negative gender stereotypes?

It largely depends on how it’s framed. 

Cycle syncing can be very positive when it’s used for self-awareness and empowerment. It can help people understand personal rhythms, anticipate symptoms, and reduce stigma. 

This kind of knowledge builds body literacy and agency, which is central to our mission here at Clue. 

However, cycle syncing can also be misused. If it’s framed as a rulebook for how people “should” perform or behave during different phases of their cycles, it risks reinforcing bias, such as implying that people with cycles are unreliable or less capable at certain times of the month.

It can be harmful to assume that they have to work harder or optimize more to compensate for the impact of their cycles.

Cycle syncing should be individualized, flexible, and voluntary. Everyone’s personal patterns and the way hormones affect them are different. No one should feel pressured to "optimize" or guilty if they decide not to sync their cycles with their work.  

"You’re in your luteal phase, so you’ll probably be less productive" - That ends up being discrimination, not support. 

So cycle syncing is not inherently bad—it can be very positive—when it’s done in a nuanced, individualized way, and with sufficient education and awareness of the risks.

What are some other benefits of tracking our menstrual cycles?

Tracking your cycle can help you understand your body, anticipate symptoms, and support both physical and mental wellbeing. For many, it’s as simple as knowing when to expect a period, making it easier to prepare or plan around it. 

Others use cycle tracking to spot connections between their cycle and experiences like sleep quality, mood, or energy. Recognizing patterns can help reduce uncertainty and stress, allowing individuals to adjust activities to live more in sync with their cycle.

Simply allowing yourself to rest when cramps or fatigue appear is already a valuable act of self-care.  

Everyone’s cycle patterns are unique - from their cycle length and bleeding levels to the symptoms they experience. Your cycle is also a vital health indicator. Irregularities or sudden changes can be an early sign of a health issue.

Tracking helps you understand what’s typical for you, so you can notice when something feels off and discuss it with your healthcare provider. 

Cycle tracking can also support fertility goals, whether you’re trying to conceive or avoiding pregnancy, by helping you understand when you’re most and least likely to be fertile. 

Disclaimer: Please note that the Clue App is not designed for pregnancy prevention and is not safe to use as a form of contraception.