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The Science Behind Sleep Flow

The Science Behind Sleep Flow

Sleep Flow combines ingredients that have been studied for sleep and relaxation. Here is what the research says, including the limits. Studies used different forms and amounts than Sleep Flow, and results are mixed: some trials found a benefit, others did not.

Tart cherry

Sleep Flow provides 430 mg of Montmorency tart cherry concentrate per serving.

  • Pigeon et al., Journal of Medicinal Food, 2010. A randomized, double-blind, crossover study in 15 older adults with insomnia. Tart cherry juice reduced time awake after sleep onset and insomnia severity compared with placebo. Time to fall asleep, total sleep time and sleep efficiency did not differ. Read the study
  • Barforoush et al., Food Science & Nutrition, 2025. A systematic review of seven studies. Some reported better sleep measures. The authors describe the evidence as limited and varied. Read the review

L-theanine

Sleep Flow provides 150 mg of L-theanine per serving.

  • Hidese et al., Nutrients, 2019. A randomized, double-blind, placebo-controlled trial in healthy adults taking 200 mg per day for four weeks. Sleep quality scores (PSQI) improved compared with placebo, including time to fall asleep and sleep disturbances. Read the study
  • Bulman et al., Sleep Medicine Reviews, 2025. A meta-analysis of randomized trials (19 articles, 897 participants) found improvements in self-reported sleep onset, daytime dysfunction and overall sleep quality. The authors say more research is needed on dose and duration. Read the meta-analysis

Chamomile (a source of apigenin)

Sleep Flow provides chamomile extract, which contains apigenin. Most human research is on chamomile, not apigenin on its own.

  • Adib-Hajbaghery & Mousavi, Complementary Therapies in Medicine, 2017. A randomized trial in older adults taking chamomile extract for 28 days. Sleep quality (PSQI) improved compared with placebo, while sleep duration did not increase.
  • Hieu et al., Phytotherapy Research, 2019. A systematic review and meta-analysis found improved sleep quality with chamomile. Evidence on insomnia was limited. Read the review
  • Kazemi et al., Complementary Therapies in Medicine, 2024. A meta-analysis of 10 trials (772 participants) found better sleep quality scores, with high variation between studies and no improvement in sleep duration. Read the review

Passionflower

Sleep Flow provides 150 mg of passionflower extract per serving.

  • Ngan & Conduit, Phytotherapy Research, 2011. A double-blind crossover study in 41 adults who drank passionflower tea for one week. Self-rated sleep quality was better than with placebo. Read the study
  • International Clinical Psychopharmacology, 2020. A double-blind, placebo-controlled study using sleep recordings in adults with insomnia disorder over two weeks. Total sleep time increased compared with placebo. Sleep efficiency and time awake did not differ. Read the study

Lemon balm

Research on lemon balm is earlier-stage. Read our summary.

These studies looked at individual ingredients, not Sleep Flow as a complete formula. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Looking for a melatonin-free way to wind down?

Meet Sleep Flow: creamy liquid sleep drops with tart cherry, L-theanine and chamomile, formulated by a longevity nutritionist with 25 years of clinical practice.

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FAQs

Questions worth asking.

About Flowever 

Flowever is a supplement brand founded by Daniela Cyrulin and focused on longevity and healthspan for adults 40+. Its formulas are built around natural ingredients with research behind them and informed by her clinical experience.

Flowever's first product is Sleep Flow, created to support a nighttime wind-down routine.

No. Flowever supplements are not a substitute for medical advice, diagnosis or treatment. Talk to your healthcare provider before starting any supplement, especially if you are pregnant, nursing, taking medication or have a medical condition.

About Sleep Flow

Sleep Flow is a thoughtfully formulated, multi-ingredient nighttime supplement designed to support relaxation and healthy, restful sleep.


Its carefully selected formula combines Montmorency tart cherry concentrate, L-theanine, lemon balm, passionflower, chamomile, and sage in a melatonin-free formula.


Rather than relying on a single ingredient, Sleep Flow takes a multi-ingredient approach to supporting your nightly sleep routine.

No. Sleep Flow does not contain added melatonin.


Instead, the formula combines Montmorency tart cherry concentrate, L-theanine, lemon balm, passionflower, chamomile, and sage to support relaxation and healthy sleep as part of your nightly routine.


Sleep Flow takes a multi-ingredient approach to sleep support — without adding supplemental melatonin.

Each serving of Sleep Flow contains:

  • 430 mg Montmorency tart cherry concentrate
  • 150 mg L-theanine
  • 200 mg lemon balm extract
  • 150 mg passionflower extract
  • 100 mg chamomile extract
  • 5 mg sage extract
  • 5 mg fennel seed extract

The ingredients were selected based on their individual research backgrounds and traditional uses related to relaxation and sleep support.

Sleep involves multiple biological and behavioral processes, so Sleep Flow was designed as a multi-ingredient formula rather than relying on a single compound.
The ingredients have different research backgrounds related to relaxation and sleep support.

Ingredients & Science 

Montmorency tart cherry naturally contains melatonin and other bioactive compounds, including anthocyanins. Some clinical research has found potential improvements in sleep-related outcomes with tart cherry preparations, although results across studies are not completely consistent.


Sleep Flow provides 430 mg of Montmorency tart cherry concentrate per serving.

L-theanine is an amino acid naturally found in tea that has been studied for relaxation and sleep-related outcomes. Research suggests that it may support subjective sleep quality and sleep onset in some populations.


Sleep Flow provides 150 mg of L-theanine per serving.

Sleep Flow takes a different approach from melatonin alone.


Melatonin supplements provide supplemental melatonin directly. Sleep Flow does not contain added melatonin. Instead, it combines Montmorency tart cherry concentrate, L-theanine, and a carefully selected blend of calming botanicals designed to support relaxation and healthy sleep.


Rather than relying on a single ingredient, Sleep Flow takes a multi-ingredient approach to your nightly sleep routine.


The right choice depends on your individual sleep needs and preferences.

How to Use 

Sleep Flow is intended for nighttime use. The most appropriate timing can depend on the individual and the specific formulation.


Follow the serving and usage directions on the product label.

Yes! Sleep Flow is designed to be taken every night as part of your nightly sleep routine. There’s no need to cycle it or take breaks.


Its carefully selected blend of calming botanicals and sleep-supporting ingredients is formulated to gently support relaxation and healthy sleep, night after night.


For most adults, Sleep Flow can be used nightly as directed. If you are pregnant or breastfeeding, have a medical condition, take medications, or have ongoing sleep concerns, we recommend speaking with your healthcare professional before starting any supplement.


Sleep better. Every night.

Yes. Sleep Flow is formulated to support relaxation and help you ease into sleep naturally.


It combines ingredients that have been individually studied for relaxation and sleep-related outcomes, including L-theanine, lemon balm, passionflower, chamomile, sage, and Montmorency tart cherry.


Sleep Flow is designed to support relaxation and a healthy transition into sleep.


Individual responses may vary, but Sleep Flow can be taken nightly as part of your bedtime routine.

Sleep Flow supports relaxation and healthy sleep throughout the night. Its carefully selected blend of calming botanicals and sleep-supporting ingredients is designed to help promote a more restful, restorative sleep experience.


Occasional nighttime awakenings are normal, and individual responses vary. 

Sleep Flow can be taken every night as part of your bedtime routine.

Who is it for? 

Sleep Flow is designed for adults of all ages who want to support relaxation and healthy, restful sleep.


While sleep patterns can change during the 40s and beyond — including during perimenopause and menopause — Sleep Flow is not limited to women 40+. Its carefully selected blend of calming botanicals and sleep-supporting ingredients makes it a versatile addition to any adult’s nightly routine.


Whether you’re in your 20s, 40s, 60s, or beyond, Sleep Flow is designed to support your nightly sleep ritual.

Sleep Flow is thoughtfully formulated with a blend of botanical ingredients, L-theanine, and Montmorency tart cherry concentrate.


The formula combines plant-based botanicals and naturally derived ingredients selected to support relaxation and healthy sleep as part of your nightly routine.


While Sleep Flow is made with carefully selected ingredients, “natural” does not necessarily mean suitable for everyone. If you are pregnant or breastfeeding, have a medical condition, or take medications, consult your healthcare professional before use.

No. Sleep Flow is not formulated with habit-forming sleep medications or conventional sedatives.


It contains a blend of calming botanicals, L-theanine, and Montmorency tart cherry concentrate designed to support relaxation and healthy sleep.


Sleep Flow can be taken nightly as directed as part of your bedtime routine.

No. Sleep Flow is a dietary supplement, not a pharmaceutical sleeping medication.


It is designed to support nighttime relaxation and healthy sleep rather than act as a conventional sedative.

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