
For painful bloating constipation and recurring constipation — a plant-based formula that improves the intestinal environment.
With One L combines the plant-based double power of "swelling dietary fiber" and "pushing herbal medicine" with "spore-forming lactic acid bacteria that reach the intestines" and "nicotinamide that helps lactic acid bacteria proliferate" in a four-ingredient formula. It addresses abdominal bloating and recurring constipation by improving the intestinal environment.


Hundreds of species and 100 trillion intestinal bacteria live in the gut. These bacteria help intestinal peristalsis and regulate intestinal pH, essential for maintaining gut health. However, when the balance is disturbed, excessive gas is produced. Sitting in the same position for long periods or stress reducing gastrointestinal movement causes gas to remain in the intestines, leading to painful abdominal bloating. With One L contains dietary fiber plus lactic acid bacteria, which absorb harmful toxins, suppress putrefactive bacteria growth, and improve the intestinal environment.
| Ingredient name | Content | Role and action |
|---|---|---|
| Plantago ovata seed husk powder | 3,000 mg | Water-soluble dietary fiber. Swells in the intestines to increase stool bulk and promote peristalsis. |
| Sennosides (As sennosides A and B, 48 mg) |
123.08 mg | Herbal medicine derived from senna. Selectively stimulates only the large intestine to promote peristalsis. |
| Spore-forming lactic acid bacteria | 130 mg | Spore formation makes it resistant to stomach acid and heat, allowing it to reach the intestines alive. It suppresses the growth of putrefactive bacteria and improves the intestinal environment. |
| Nicotinamide | 5 mg | A type of vitamin B3. Acts as a growth factor to help the proliferation of spore-forming lactic acid bacteria in the intestines. |
* Other With One series (New With One, New With One α) have a daily dose of 3.6g (3 packets), but With One L has a daily dose of 4.8g (3 packets), with a different amount per packet.
| Age | Single dose | Timing of intake |
|---|---|---|
| Adults (15 years and older) | 3/4 to 1 packet | 1 to 3 times a day, after meals |
| 11 years old to under 15 years old | 1/2 to 2/3 packet | 1 to 3 times a day, after meals |
| 3 years old to under 11 years old | 1/4 to 1/3 packet | 1 to 3 times a day, after meals |
| Under 3 years old | Do not take | |
Always start with the minimum amount for the first time and gradually increase or decrease while monitoring bowel condition.
When children take it, always do so under the guidance and supervision of a guardian.
Cascara sagrada dried extract
Sankirai extract (skin care)
Spore-forming lactic acid bacteria that reach the intestines
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What is the difference from other With One series?With One L's biggest feature is the added "spore-forming lactic acid bacteria that reach the intestines" and "nicotinamide that helps lactic acid bacteria proliferation." For painful constipation with bloating or recurring constipation, L is recommended to improve the intestinal environment. For first-time users, choose New With One; for those concerned about skin troubles, choose New With One α.
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What is the difference between spore-forming lactic acid bacteria and regular lactic acid bacteria?General lactic acid bacteria tend to die before reaching the intestines due to stomach acid, bile acids, and heat, but spore-forming lactic acid bacteria form spores, making them resistant to heat and acid, allowing them to reach the intestines alive. After reaching the intestines, they proliferate and suppress the growth of harmful bacteria like putrefactive bacteria, improving the intestinal environment.
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Why is the daily amount different from other With One series?With One L contains lactic acid bacteria and nicotinamide, so the daily amount is 4.8g (3 packets), which is more per packet than other series (3.6g). The amounts of dietary fiber and sennosides are equivalent.
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Why is it necessary to drink plenty of water?The main ingredient, Plantago ovata seed husk powder, is a dietary fiber that absorbs water and swells. Taking it with a full glass (about 180mL) of water allows it to swell properly in the intestines and be effective. Insufficient water may cause it to swell in the esophagus or stomach.
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From what age can it be used?It can be taken from age 3 and up. When children take it, always do so under the guidance and supervision of a guardian. Do not give to children under 3 years old.
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Can it be used during breastfeeding?If you are breastfeeding, either do not take this medicine or avoid breastfeeding while taking it. For details, consult a pharmacist or registered seller.
- This is a Designated Class 2 OTC Drug. Consult a pharmacist or registered seller before use.
- Do not give to infants under 3 years old.
- Always take with a full glass (about 180mL) of water or lukewarm water. Taking without enough fluid is dangerous.
- If you are breastfeeding, either do not take this medicine or avoid breastfeeding while taking it.
- If you are pregnant or may be pregnant, consult a doctor or pharmacist before taking.
- If you have severe headache, nausea, or vomiting, consult a doctor or pharmacist before taking.
- If symptoms do not improve or worsen, stop taking the medicine and consult a doctor or pharmacist.
- Store in a cool, dry place away from direct sunlight and out of reach of children.
- Do not take products past their expiration date.
The plant-based laxative "With One" is a brand born with the concept of addressing women's true feelings and concerns for natural-like bowel movements.
- 1955 Founded as Zeria Yakusou Research Institute in Chuo-ku, Tokyo.
- 1970 Company name changed to Zeria Pharmaceutical Co., Ltd.
- November 1987 Plant-based laxative With One launched — born as Japan's first full-fledged plant-based laxative.
- 2000 Listed on the First Section of the Tokyo Stock Exchange (now Prime Market).
- January 2012 Improved formula versions New With One and New With One α released. Evolved into a series selectable by specific concerns.
- ~Present With the addition of With One L, it has become a representative brand of Japanese plant-based laxatives, now covering intestinal environment care as a series.














































































