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Four Substance
~ Inspired by Four Substance Decoction | Si Wu Tang
Four Herbs in this Formulai
A foundational formula in Traditional Chinese Medicine, Si Wu Tang (Four Substance) is traditionally used to nourish Blood and support a balanced monthly cycle. With roots in classical herbal theory, this blend of four gentle yet powerful herbs is designed to promote vitality, emotional well-being, and regular rhythm throughout the month. Ideal for daily use after the cycle has ended, Four Substance helps support the body’s natural flow and internal harmony.
Four Substance is great for:
- Supporting a healthy and balanced menstrual cycle
- Nourishing and replenishing Blood in accordance with Traditional Chinese Medicine principles
- Promoting emotional well-being and monthly resilience
- Encouraging internal harmony and overall vitality
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Four Substance Decoction, or Su Wu Tang, is a beloved Traditional Chinese herbal formula composed of four time-honored herbs that work together to support a woman’s monthly rhythm. Traditionally used to nourish Blood and encourage balance, this formula promotes a more grounded, harmonious cycle throughout the month.
Widely embraced across East Asia, Four Substance is often incorporated into monthly wellness rituals to support energy levels and emotional equilibrium — especially after the menstrual phase.
With continued use, this gentle blend supports the body’s natural flow and rhythm, offering nourishment, resilience, and a sense of calm from one cycle to the next.
When Four Substance Works Best
Four Substance (Si Wu Tang) is traditionally taken in the days following the menstrual phase, once natural bleeding has concluded. The formula is typically used twice daily for 4–5 days to help nourish and restore the body’s vital energy, setting the stage for a more balanced and harmonious month ahead.
Consistent use over multiple cycles may provide cumulative benefits, supporting overall vitality and emotional steadiness.
This formula is especially suited for:
- Women seeking monthly support for balance and emotional well-being
- Those looking to promote healthy cycle rhythm
- Supporting the body’s natural recovery after childbirth
- Easing feelings of depletion after the cycle has ended
- Integrating gentle cycle support into fertility wellness plans
The Formula
Four Substance Decoction, or Si Wu Tang, is a classic formula in Traditional Chinese Medicine, made from four harmonizing herbs that work together to nourish Blood and support a balanced monthly cycle. A key ingredient, White Peony Root (Bai Shao), is traditionally used to calm the Liver and harmonize the Blood — especially during times of stress or emotional strain.
This elegant yet powerful combination is widely embraced across East Asia as part of a regular wellness routine to help promote inner balance and monthly rhythm.
The Herbs
Purity, authenticity and sustainability are pillars of DAO Labs, which translates into the way we source our herbs. We use only sustainably-sourced herbs from Good Agriculture Practice farms, and go to extreme lengths to test and verify along our supply chain. All herbs are third-party tested in the U.S. for both safety and authenticity.
Learn more about the four herbs in Four Substance below.
Rehmannia (root)/Shu Di Huang
Known traditionally as an herb used to "balance the yin," this powerful root is often used to nourish the blood and help with irregularity.
Tangkuei (root)/Dang Gui
AKA: Chinese Angelica RootCommonly referred to as “female ginseng,” Chinese angelica root helps to strengthen, harmonize and regulate the blood, as well as reduce swelling during moments of stress.
White Peony (root)/Bai Shao
Don’t let those delicate flowers fool you! The mighty roots of the peony plant have been used for centuries to nourish the blood and calm the liver during stressful times.
Ligusticum (root)/Chuan Xiong
Known as the number one formula for nourishing the blood, this leaf-like herb has the ability to encourage blood flow and alleviate common menstrual pains such as headaches.
Dr. Karchmer on Four Substance
Dr. Karchmer on Four Substance
“A women’s monthly cycle is draining - literally. Pregnancy, childbirth and breastfeeding are even more demanding on the body. In our rush to succeed to school, careers and social horizons of our modern world, it is also possible to not full appreciate the unique physiology of women related to menstruation. Indeed, some women may find their period a hassle, a needless interruption to the schedule, a problem to be managed pharmacologically - there’s where Four Substance can make an incredible difference.”
Read More About Four Substance From DR. KARCHMER >
Love this Formula
“This formula took a while, but the benefits are well worth the wait. I now take it after my cycle has ended and it helps on a number of levels - from energy to just making me feel normal. I highly recommend.”
Verified Four Substance Enthusiast
- Customer Reviews
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5
★★★★★★★★★★ Based on 8 reviews
★★★★★★★★★★ Anonymous
on 06/16/2026 Verified Buyer
Try It…You’ll Like It
Exceeded expectations by far.
★★★★★★★★★★ Anonymous
on 06/08/2026 Verified Buyer
Lifesaver
Hugely improved my menstrual cramps after 2-3 cycles of use.
★★★★★★★★★★ Anonymous
on 05/15/2026 Verified Buyer
Recommend
I can feel the difference and plan to stick with this product.
★★★★★★★★★★ Anonymous
on 04/30/2026 Verified Buyer
I can feel it.
This product was recommended to me by a friend and I can definitely feel an increase in my energy and more!
★★★★★★★★★★ Anonymous
on 03/16/2026 Verified Buyer
Try This!
This product really seems to help! I can feel the difference and will continue enjoying.
★★★★★★★★★★ Anonymous
on 01/04/2026 Verified Buyer
Has really helped
I’ve struggled with issues with my period most if my life and nothing really has never helped. This has made a huge difference, my period is significantly shorter and has helped with stagnation.
★★★★★★★★★★ Anonymous
on 12/19/2025 Verified Buyer
Highly highly recommend
This formula works as described. I can feel the energy and things seem to be moving in the right direction!
★★★★★★★★★★ Anonymous
on 10/31/2025 Verified Buyer
I think it’s working
I can feel the difference and am going to continue using.
Have a question about this formula? Contact our team.