Can I use saliva, petroleum jelly, or water as lube? | The maker warns against urethral saliva [OK Prostate Chip]

This page is based on entries from "ok-lab's diary" (https://ok-lab.hatenablog.com/), the Japanese development diary written by Mr. Okada, founder of OK Lab, a small company in Japan (Okada Comfortable Life Laboratory). Only the entries about "saliva, petroleum jelly, and water as lubricants" are summarized here, in order of publication. Past prices and sizes are as written at the time. Current prices come from the official product list (retrieved September 4, 2026). Quotations are translated from Japanese.

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Note: This page is a personal reading log by someone with no connection to the maker or the seller. It reflects the source entries as of their publication dates and makes no guarantee of accuracy or safety. The product is not a medical device; talk to a doctor about any health decision. Check the official site for current information. This page contains advertising.

In short

Reports describe easier movement, sticking, pain, and bleeding even when lubrication was present.

Mr. Okada warns against urethral saliva and petroleum jelly with condoms; his water advice depends on the device.

The current list includes a curved resin chip from these reports; later entries also describe commercial lubricating jelly.

If you see blood in your urine, even a small amount or for the first time, do not wait and see. See a urologist right away. If you suddenly cannot urinate, or the device cannot be removed, do not try to fix it yourself. Go to a medical facility, including emergency care, immediately.

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About this product

The OK Prostate Chip is a small device that is placed in the urethra (the urine passage) so that it acts on the prostate; the maker sells it in several shapes, sizes and materials. It is made and sold by OK Lab (Okada Comfortable Life Laboratory), a small company in Japan, through its own online store, and prices are in Japanese yen (JPY).

The maker's development diary, "ok-lab's diary", is written in Japanese. This page is an English summary of it, and every quotation is translated.

OK Lab ships internationally, so readers outside Japan can order (see "Buying from outside Japan" below). Product names on this page are plain-English descriptions. The official Japanese product name is shown once in the product table so you can find the same item in the store.

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Before you read: key terms

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What happens: saliva, petroleum jelly, or water as lube

The OK Prostate Chip is a small device placed in the urethra to act on the prostate. Lubricants (lube) are substances discussed in these entries as ways to reduce sticking where a device meets the body's lining. The accounts concern urethral chips and separate anal chips, which act from the bowel side. Water, petroleum jelly, and saliva appear in different tests, with different materials and outcomes.

Lotion helped one beginner after an attempt stopped before 5mm

A staff member's beginner report, published in October 2017, described stopping before the chip had advanced 5mm. A second attempt with baby lotion progressed inside the penis head, but the beginner still struggled and ended that attempt.

Mr. Okada's response distinguished dry conditions and chip materials. He considered lotion safer for resin when the urethra was dry, while his glass-chip experience suggested water could replace lotion.

(Source: ok-lab's diary, published October 2017)
https://ok-lab.hatenablog.com/entry/20171019/1508375473

Petroleum jelly did not prevent sticking during prolonged anal-chip use

In an entry published in November 2018, a customer described a spiral anal chip with petroleum jelly as the only lubricant. After 12 hours, the customer reported a sticking sensation against the bowel lining, despite no bleeding or device deformation.

Mr. Okada thanked the customer and said the report exceeded his expectations. He also requested reports of further trouble and cautioned against excessive expectations.

(Source: ok-lab's diary, published November 2018)
https://ok-lab.hatenablog.com/entry/20181117/1542436271

Petroleum jelly did not prevent bleeding with a textured chip

In an entry published in October 2020, a customer reported trouble with a textured 3–1 chip. During the second attempt, it rotated within the first 5cm of the opening despite petroleum jelly, followed by fresh blood.

The customer reported little pain but later noticed blood spots on the body and hands. Mr. Okada thanked them without addressing the bleeding; the diary does not record a medical assessment or subsequent recovery.

(Source: ok-lab's diary, published October 2020)
https://ok-lab.hatenablog.com/entry/2020/10/24/115457

Water as lube felt different from urine-wet conditions in one report

In an entry published in March 2021, a customer associated easier passage with the entire chip wet with urine immediately after urination. A separate attempt with tap water on the chip, outside that timing, was harder.

Mr. Okada thanked the customer and said the reported difference was new to him. The account changed both the liquid and the timing; it did not establish which explained the difference.

(Source: ok-lab's diary, published March 2021)
https://ok-lab.hatenablog.com/entry/2021/03/06/125456

Water as lube did not resolve concerns about longer tubes

In an entry published in April 2022, Mr. Okada described recurring pain with a long silicone tube (a hollow component attached to the assembly). He reported relief associated with renewed water exposure and suspected drying and sticking against the lining, rather than damage from the tube.

He also experienced pain with about 7cm of tubing, while a roughly 2cm section at the penis head felt comfortable. He decided against selling the long-tube version because he did not want to offer a device unsuitable for prolonged wear.

(Source: ok-lab's diary, published April 2022)
https://ok-lab.hatenablog.com/entry/2022/04/23/123121

Generous lubricant failed to resolve one customer's silicone-tube resistance

In an entry published in August 2022, a customer reported strong resistance and worsening pain despite generous lotion on a silicone-tube assembly. Burning during urination followed removal, although the customer said it had largely settled by the next day.

Staff could not identify the cause and suggested possible lubricant incompatibility or a cleaning difference. A follow-up reported almost unchanged friction after an approximately 3-minute boiling test.

Mr. Okada said he lacked enough lubricant knowledge to advise confidently and questioned whether his own experience applied to others. He kept manufacturing existing orders while withholding new tube-product proposals pending a decision.

(Source: ok-lab's diary, published August 2022)
https://ok-lab.hatenablog.com/entry/2022/08/20/122920

Reduced petroleum jelly coincided with staining, but the cause remained uncertain

In an entry published in September 2022, Mr. Okada described yellow staining on a silicone-covered aluminum anal chip. That test involved petroleum jelly only around the anal opening, with none on the device itself.

He could not tell whether the difference reflected the missing coating or the stool's consistency. He reported that boiling did not readily remove the staining and said further cleaning tests were planned.

(Source: ok-lab's diary, published September 2022)
https://ok-lab.hatenablog.com/entry/2022/09/17/123057

Water as lube later sufficed for his heart-shaped stopper

In entries published in December 2025, Mr. Okada described a heart-shaped stopper (a component intended to resist outward movement). Water initially failed in his test, and he reported using saliva despite warning others against copying him.

A later entry said water was sufficient, but he could not distinguish improved technique from changes at the opening. His warning specifically prohibited saliva on the main chip intended to remain near the prostate.

(Source: ok-lab's diary, published December 2025)
https://ok-lab.hatenablog.com/entry/2025/12/06/122924

(Source: ok-lab's diary, published December 2025)
https://ok-lab.hatenablog.com/entry/2025/12/13/122917

Commercial lubricating jelly enabled repeated tests in the maker's later work

In an entry published in April 2026, Mr. Okada described buying lubricating jelly for tests of an unfinished retrieval-device prototype. He said its label mentioned instrument insertion and that it enabled repeated testing when his own secretions no longer provided enough lubrication.

He described this purchase as a first for him. He still thought a less sticky liquid might suit tubes better, based on his experience with water.

(Source: ok-lab's diary, published April 2026)
https://ok-lab.hatenablog.com/entry/2026/04/11/122913

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The maker's answer to saliva, petroleum jelly, or water as lube

Mr. Okada's replies contain explicit exclusions and experimental suggestions, rather than one lubricant choice for every device.

Petroleum jelly with condoms drew an explicit warning from the maker

In an entry published in November 2018, Mr. Okada said he favored petroleum jelly because it lasted and reduced stool sticking. However, he explicitly acknowledged that using it with rubber condoms was unacceptable because oil could damage the rubber. He pointed instead to lotion sold by condom manufacturers, referring to the condom instructions.

(Source: ok-lab's diary, published November 2018)
https://ok-lab.hatenablog.com/entry/20181110/1541826499

Saliva as lube worked in a test he would not recommend

In an entry published in February 2021, Mr. Okada described difficulty with a twin-chip assembly. He reported much easier passage with a drop of saliva, but also acknowledged possible food particles after recently eating rice crackers. Mr. Okada said he could not recommend the experiment.

(Source: ok-lab's diary, published February 2021)
https://ok-lab.hatenablog.com/entry/2021/02/20/130830

Honey as lube appeared in an experiment explicitly discouraged by the maker

In an entry published in December 2021, Mr. Okada described a mold-making prototype enlarged to allow for ceramic shrinkage of about 15%. Water and lubricant from a condom had failed in his test; he then reported success with honey. Mr. Okada explicitly warned against copying this experiment.

(Source: ok-lab's diary, published December 2021)
https://ok-lab.hatenablog.com/entry/2021/12/11/124426

A lubrication nozzle received a historical price, without a strong recommendation

In an entry published in March 2024, Mr. Okada described a deep-urethral lubrication nozzle (a tube attachment intended to carry liquid farther inside). He offered to make one for ¥500 (about $3 at ¥156 = $1, rate as of 2026-09-04) excluding tax, with its 4mm tube section up to 25cm long. Mr. Okada stopped short of recommending the attachment, suggesting that more convenient devices might exist.

(Source: ok-lab's diary, published March 2024)
https://ok-lab.hatenablog.com/entry/2024/03/09/122635

Saliva for anal devices did not receive permission for urethral use

In an entry published in July 2025, Mr. Okada discussed saliva during testing of a larger loop-shaped anal device. He reported easier passage with saliva present on both the device and the anal area. Mr. Okada rejected urethral saliva lubrication because he did not trust saliva's ability to control germs.

(Source: ok-lab's diary, published July 2025)
https://ok-lab.hatenablog.com/entry/2025/07/19/122907

If you see blood in your urine, even a small amount or for the first time, do not wait and see. See a urologist right away. If you suddenly cannot urinate, or the device cannot be removed, do not try to fix it yourself. Go to a medical facility, including emergency care, immediately.

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How saliva, petroleum jelly, or water as lube changed over time

The diary does not say what the current state is.

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OK Prostate Chip products related to saliva, petroleum jelly, or water as lube

The curved resin chip below appears in a lubrication complaint, rather than as a solution to it.

Products that appear in these entries

The flat-faced curved resin chip is listed in the company's own online store.

(Source: ok-lab's diary, published February 2022)
https://ok-lab.hatenablog.com/entry/2022/02/26/123231

Products the diary mentioned as alternatives

The diary names no alternative.

Historical test assemblies, prototypes, and nicknames discussed above include the textured 3–1 chip, twin-chip assembly, heart-shaped stopper, and lubrication nozzle. No matching product can be confirmed on the current list.

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Common worries about saliva, petroleum jelly, or water as lube

"Can a glass chip break despite water as lube?"

In an entry published in January 2018, a customer asked whether connected glass chips could collide and break, causing injury. Mr. Okada could not guarantee they would remain intact, although he thought breakage unlikely in his own use.

He reported successful testing of two linked resin chips without lotion. Mr. Okada proposed resin for customers worried about glass breakage and for shorter use.

(Source: ok-lab's diary, published January 2018)
https://ok-lab.hatenablog.com/entry/20180121/1516504265

"Why does my chip stick despite lubricating jelly?"

In an entry published in February 2022, a customer using the flat-faced curved resin chip asked about lubrication farther inside the urethra. Jelly on the chip had not prevented sticking, and the customer associated the difficulty with reduced natural secretions.

The diary does not record whether the proposed lubrication changes helped this customer. Mr. Okada proposed better lubricant coverage, estimating about 3 applications, or water, which his reply assumed was clean.

(Source: ok-lab's diary, published February 2022)
https://ok-lab.hatenablog.com/entry/2022/02/26/123231

"Could a tube still stick despite urine providing lubrication?"

In an entry published in July 2022, a customer worried that urine traveling inside a tube would leave its outside dry and painful. The customer's existing assembly had already caused discomfort, prompting questions about a different tube arrangement.

Mr. Okada acknowledged that dryness-related friction might remain a problem. His answer focused on moisture outside the tube, rather than treating urine flow through its center as sufficient lubrication.

(Source: ok-lab's diary, published July 2022)
https://ok-lab.hatenablog.com/entry/2022/07/23/123014

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Buying from outside Japan

OK Lab ships internationally to countries covered by Japan Post's EMS courier service. Overseas orders are paid in advance by PayPal. Each order carries a ¥400 (about $3 at ¥156 = $1, rate as of 2026-09-04) handling fee, and EMS shipping is charged on top. These terms come from OK Lab's official sales-terms page (written here as plain text, not a link: ok-lab.net/docs/law), checked on September 7, 2026; confirm them on the official store before you order, because they can change.

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Summary of this article

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Source: ok-lab's diary (Okada Comfortable Life Laboratory). The original entries are in Japanese; quotations on this page are translated. Photos and videos are on the original entries.