SilentCycle™

OBGYN-Formulated PMS+Mood Support

Developed by a board-certified OB/GYN with evidence-based ingredients that support a positive mood, emotional balance, and physical comfort throughout the luteal phase.

Have your period, without all the noise.
Nathan King, Founder of Femanual

Meet the founder

Hi, I’m Dr. Nathan King — the OB/GYN behind Femanual.

I started Femanual because I wanted women to have access to clear, validating, and evidence-based information about their health.

Over the years, one question came up again and again in my office:

“What supplements are actually worth trying?”

Women are looking for more natural ways to support their health, but are left to navigate a wellness industry filled with conflicting advice, bold claims, and questionable evidence.

Our Health + Wellness line was created to help bridge that gap. My goal is simple: create products I feel comfortable recommending to my own patients.

SilentCycle™ is our first product: a PMS and mood support supplement designed to support women through the emotional and physical changes of the luteal phase. It's made with science-backed ingredients in bioavailable forms with transparent dosing.

Who is it for?

Support for the days your cycle feels loud.

Whether your cycle leaves you feeling more irritable, emotional, stressed, uncomfortable, or simply not like yourself, SilentCycle™ was formulated for you.

Tap each bubble to explore what SilentCycle™ supports.

PMS + Mood Support

Who is it for?

Support for the days your cycle feels loud.

Whether your cycle leaves you feeling more irritable, emotional, stressed, uncomfortable, or simply not like yourself, SilentCycle™ was formulated for you.

Tap each bubble to explore
what SilentCycle™ supports

PMS + Mood Support

Comprehensive
PMS + Mood Support

Inside the formula

Six ingredients. Chosen with a reason.

The menstrual cycle involves complex shifts that can affect mood, stress resilience, sleep, and physical comfort.

SilentCycle™ was formulated by a practicing OB/GYN using clinically studied ingredients, standardized botanical extracts, and bioavailable nutrient forms — without proprietary blends or marketing gimmicks.

01

100 mg elemental

Magnesium Bisglycinate Chelate

Magnesium supports neuromuscular relaxation and stress regulation. SilentCycle™ uses magnesium bisglycinate, a highly bioavailable form bound to glycine that is gentler on digestion than magnesium oxide.

  • Highly bioavailable form
  • Gentler on digestion
  • Supports calm + cycle comfort
02

30 mg standardized

Saffron Stigma

Saffron has been studied for emotional balance and positive mood throughout the menstrual cycle. SilentCycle™ uses a standardized 0.3% saffron extract for consistent potency.

  • Supports positive mood
  • Standardized extract
  • Commonly studied 30 mg dose
03

20 mg P-5-P

Activated Vitamin B6

P-5-P is the biologically active form of vitamin B6, which plays a role in neurotransmitter production. Unlike pyridoxine HCl, P-5-P is already in its active form.

  • Active B6 form
  • Supports balanced mood
  • No liver conversion step
04

200 mg

L-Theanine

L-theanine supports a calm, focused state without drowsiness. It is included as pure L-theanine rather than a vague calming blend.

  • Supports calm focus
  • Non-drowsy support
  • Published research dose
05

30 mg standardized

Chaste Tree Berry (Vitex)

Vitex agnus-castus is one of the most researched botanicals in women’s health. SilentCycle™ uses a standardized extract containing 0.5% agnusides for predictable potency.

  • Supports cycle regularity
  • Standardized 0.5% agnusides
  • Used across multiple cycles
06

250 mg extract

Ginger Root

Ginger supports digestive health and overall cycle comfort. SilentCycle™ uses a standardized 5% ginger extract for consistent active compounds instead of variable raw powder.

  • Supports digestive comfort
  • Standardized 5% extract
  • Cycle comfort support

How it works

Consistency matters.

SilentCycle™ is designed for consistent daily support. Scroll through to see how results build cycle after cycle.

Cycle 1
Initial impact

You should notice a greater sense of calm and balance, early signs it’s working.

Levels building

Most users notice positive changes in comfort, mood, and overall well-being.

Full effect

This is where SilentCycle™ shines. Get consistent support, cycle after cycle.

What customers are saying

“I feel much calmer and more patient and have more energy than I typically do during this time.”

— B. Burnett

“Within a few weeks, I felt more balanced, less irritable, and experienced fewer mood swings than usual.”

— Jessica

“I have been feeling much more energetic and at peace.”

— L.L.

“This was my first period after starting this supplement, and it seemed to help with my irritability and fatigue.”

— Ynnaile E.J.S.

“I didn’t get the mood swings that usually accompany my period.”

— Amazon Customer

“[My wife] has been taking these vegan capsules for a while now and has noticed a wonderful difference in her daily clarity.”

— Kaden

“No weird side effects, no ‘why do I feel off?’ moments, which honestly already puts it ahead of a lot of supplements.”

— Amazon Customer

“It seems to be very effective at calming and mood support.”

— Amazon Customer

“The ingredient combination and dosage are excellent. All my favorite ingredients were combined in one supplement.”

— ST

“I respond well to L-theanine, magnesium, and saffron, and here they are in one convenient dose.”

— Amazon Customer

“There is no taste, they are easy to swallow, and they did not upset my stomach.”

— Amazon Customer

“It’s nice to have multiple supportive ingredients combined into one supplement, making it a convenient option for those looking to keep things simple.”

— Mary in Houston, TX

First-Time Customer Offer

Trying any supplement requires trust.

We know that what you put in your body matters. That’s why we took our time formulating SilentCycle™, choosing high-quality ingredients backed by clinical research.

We believe in the formula and its ability to help support women who struggle with emotional PMS.

That’s why first-time purchases receive 20% off (automatically applied), free shipping, and are backed by our 45-Day First Bottle Money-Back Guarantee.

45-Day First Bottle Money-Back Guarantee

Use SilentCycle™ as directed. If you don’t notice the benefits you were hoping for, email us within 45 days of delivery and we’ll refund the cost of your first bottle, no questions asked. No return is required.

OB/GYN Formulated Vegan Non-GMO Gluten-Free Soy-Free Made in the USA SQF-Certified Manufacturer No Artificial Colorants

Why SilentCycle?

Not all PMS support is created equal.

Compare the ingredients, doses, and formulation choices that set SilentCycle™ apart from standard PMS formulas.

Standard PMS Supplements
Femanual Health + Wellness SilentCycle™
Why it matters The difference is in the details.
Magnesium Oxide
Magnesium Bisglycinate Chelate

Many magnesium forms are less bioavailable and may cause digestive sensitivity in some individuals.

Magnesium Bisglycinate Chelate is highly bioavailable and well tolerated, supporting muscle comfort and nervous system function.

Inactive Vitamin B6 (Pyridoxine HCl)
Activated Vitamin B6 (P-5-P)

Standard Vitamin B6 (pyridoxine) must be converted by the liver before it can be used.

P-5-P is the active form of vitamin B6, ready to be used once absorbed to support healthy mood and neurotransmitter function.

Generic Vitex (Chasteberry) Powder
Standardized Vitex (Chasteberry) Extract

Vitex (Chasteberry) is known for supporting hormonal balance, but generic powders can vary widely in potency and consistency.

Our Vitex extract is standardized to contain 0.5% agnusides (the key ingredient) for consistent potency and quality.

Dong Quai
Standardized Saffron Extract

Some botanical blends rely on trending ingredients despite limited evidence for mood support.

Published research suggests Saffron may help support emotional balance during the menstrual cycle.

Lemon Balm
L-Theanine

Standard botanical blends may provide varying levels of support.

L-theanine supports a calm, focused state without causing drowsiness.

Peppermint or Fennel
Standardized Ginger Root Extract

While peppermint and fennel can show up in bloating support formulas, they may not support overall cycle comfort.

Ginger root supports both cycle comfort and digestive ease. Our standardized extract provides consistent support throughout the cycle.

Marketing-led or influencer-designed blends
Designed by a Board-Certified OB/GYN

Many wellness trends prioritize marketing over formulation.

Our formulation is built around published research, ingredient quality, and women’s needs.

Swipe to compare

The Wellness Line

Evidence over hype.

Clear, evidence-based education to help you better understand what is actually inside the supplements you take.

Swipe to explore

The Formulation of SilentCycle

Questions

What to know before you start.

A few quick answers about how to take SilentCycle™ and who should check in with a healthcare provider first.

How long does it take to work?

Some people may notice support within their very first cycle, while others may need 2–3 cycles of consistent use. For best results, take SilentCycle™ consistently every day, not just during your luteal phase or period.

How do I take SilentCycle™?

Take 2 capsules daily with food and water. Some people may experience stomach sensitivity when taking botanical ingredients on an empty stomach.

Most users can take both capsules together. However, if you're sensitive to supplements, consider splitting the dose into 1 capsule in the morning and 1 capsule in the evening.

Does SilentCycle™ contain hormones?

No. SilentCycle™ does not contain estrogen, progesterone, or any synthetic hormones.

However, some ingredients, including vitex, may influence the body's own natural hormonal signaling pathways. If you have a hormone-sensitive condition, such as breast cancer, or have questions about whether SilentCycle™ is appropriate for you, speak with your healthcare provider before use.

Can I take SilentCycle™ while trying to conceive?

Some studies have evaluated vitex’s role in supporting women who are trying to conceive, but individual circumstances vary. If you are actively trying to become pregnant, we recommend discussing SilentCycle™ with your healthcare provider before starting.

Can I take SilentCycle™ while pregnant or breastfeeding?

SilentCycle™ was formulated to support women during their menstrual cycles and is generally not intended for use during pregnancy.

While SilentCycle™ contains no hormones, some ingredients, including vitex, may influence the body's natural hormonal signaling. Because pregnancy and breastfeeding have unique hormonal and nutritional considerations, we recommend discussing SilentCycle™ with your healthcare provider before use.

If you become pregnant while taking SilentCycle™, speak with your healthcare provider about whether you should continue or discontinue use.

Can I take SilentCycle™ with hormonal birth control?

SilentCycle™ contains no hormones and is not intended to replace hormonal birth control. Because vitex may influence the body's natural hormonal signaling pathways, and because methods of hormonal contraception vary widely, we recommend discussing SilentCycle™ with the healthcare provider who prescribes your contraception before starting.

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What is Femanual?

Femanual was built by a gynecologist to bridge the gap between medical expertise and real life - helping you understand your body without beating around the bush. Our Health + Wellness line is specifically designed with the female body in mind, using evidence-based natural ingredients to support everyday comfort, balance, and overall well-being.

Read the Manual
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent disease.