Can I use saliva as lubricant? | The maker says no [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 "lubricant rules: no saliva" 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

• The diary links inadequate lubrication with resistance, sticking, and injuries, including a chip requiring hospital removal.
• Mr. Okada warns against saliva as urethral lubricant and forcing a chip when the passage is dry.
• His January 2026 report still raised concerns about relying entirely on bodily fluid for lubrication.

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: not enough lubricant

The OK Prostate Chip is a small device placed in the urethra (urine passage) to act on the prostate. The diary discusses lubricant as something used on the chip and within that passage to help movement when moisture is lacking. Mr. Okada connects insufficient moisture with resistance, sticking, and injury, based on his own tests and customer reports. His warning about saliva concerns its use inside the urethra.

Chip sticking was reported after a resin test device stopped vibrating

In an entry published in February 2020, Mr. Okada described daily tests of a vibrating resin chip. He reported no discomfort while vibration continued, but sometimes felt the chip sticking to the urethral lining about 10 hours after vibration stopped. He said the sensation changed again when vibration resumed.

This account formed part of his reply to a customer considering extended use of a detachable resin companion chip. The diary does not record that customer's experience with the purchased companion chip. Mr. Okada said he did not recommend 24 hours of continuous resin-chip use.

(Source: ok-lab's diary, published February 2020)
https://ok-lab.hatenablog.com/entry/2020/02/29/155031

Dryness was the maker's explanation for a damaged 4-wire cable

In an entry published in July 2022, a customer reported pain and wire protruding from a 4-wire cable. The customer had stopped using it and asked about replacing the cable with a stronger version. Mr. Okada said a blocked tip and continued pressure could leave the wire nowhere to go except bending, especially without internal moisture.

He offered cable replacement, while explaining that the damaged wire itself could not be repaired. The diary does not record whether the replacement was completed. Mr. Okada advised against forcing progress when the body was resisting it.

(Source: ok-lab's diary, published July 2022)
https://ok-lab.hatenablog.com/entry/2022/07/09/123142

A chip stuck near the penis base required hospital removal

In an entry published in August 2022, a customer described a short resin chip with an auxiliary chip becoming stuck. After roughly 1 hour without more lubricant, it became fixed near the penis base. About 10 home attempts failed; hospital staff removed the chips on day 5 with a cystoscope (viewing instrument) and forceps (grasping tools).

The customer reported whitened, damaged urethral lining and a warning about possible dribbling after recovery. They identified prolonged lodging and insufficient ongoing lubrication as prevention concerns, while acknowledging that precautions could not eliminate risk. Mr. Okada suggested paying attention to the chip's position and condition.

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

A chip stuck again after the customer changed lubrication

An entry published in September 2022 explicitly followed up on the August hospital case. The same customer reported another episode involving overlapping chips, despite changes intended to improve lubrication and limit prolonged lodging. This time, the chips retained some movement, and the customer reported removal after 3 hours.

The customer said their precautions' effectiveness was uncertain. Mr. Okada accepted the account and warned that forceful movement through a dry passage would cause injury. His advice was against forcing a chip inward or outward under those conditions.

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

A customer linked painful urination to too little lubricant

In an entry published in January 2025, a customer asked whether painful urination with a resin chip would improve through familiarity. OK Lab's staff said they could not determine the cause and raised possible injury during placement. The customer later attributed the initial pain to too little lubricant and reported smoother placement and pain-free urination after changing lubrication.

The diary presents that explanation as the customer's assessment. The staff's advice had been to pause because the passage might have been injured.

(Source: ok-lab's diary, published January 2025)
https://ok-lab.hatenablog.com/entry/2025/01/11/122910

Mr. Okada suspected dryness after bleeding during a prototype test

In an entry published in January 2026, Mr. Okada reported slight bleeding during a test of a New Year prototype. He wrote that it had not bent as expected and that he had forced it despite feeling little desire to test it. He suspected insufficient moisture and friction against the lining.

He also questioned relying entirely on Cowper's fluid (the bodily fluid he used for lubrication). His proposed precaution was added lubricant rather than sole reliance on that fluid.

(Source: ok-lab's diary, published January 2026)
https://ok-lab.hatenablog.com/entry/2026/01/03/122924

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The maker's answer to not enough lubricant

Mr. Okada's advice emphasizes moisture, avoiding force, and rejecting saliva as urethral lubricant.

Lubricant safety included withholding a prototype over possible urethral injury

In an entry published in October 2017, Mr. Okada said he had no plans to sell the experimental device discussed there. He described a voluntary restriction against selling products that could injure the bladder, alongside concern about urethral injury. He worried that someone absorbed in pleasure could exceed the limits he intended.

The supplied paragraph does not identify the experimental device precisely. Mr. Okada explicitly warned against trying the speculative activities that followed his account.

(Source: ok-lab's diary, published October 2017)
https://ok-lab.hatenablog.com/entry/20171022/1508644866

When a chip won't go in, Mr. Okada stresses moisture

In an entry published in February 2020, a customer asked whether a chip that stopped inside should be forced farther. Mr. Okada considered insufficient moisture the most common explanation, while acknowledging that he could not assess every individual cause. He discussed lubricant and the body's own moisture as possible sources of lubrication.

The diary does not record whether this customer's difficulty was resolved. Mr. Okada warned that forcing movement against a dry lining could cause bleeding and advised against it.

(Source: ok-lab's diary, published February 2020)
https://ok-lab.hatenablog.com/entry/2020/02/29/155031

Saliva as lubricant received an explicit warning in July 2025

In an entry published in July 2025, Mr. Okada addressed saliva while discussing a prototype intended for other body areas. He described saliva as an effective lubricant but said its germ-killing ability could not be trusted. His urethral warning appeared within that broader product discussion. Mr. Okada expressly rejected saliva as lubricant inside the urethra.

(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 not enough lubricant changed over time

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OK Prostate Chip products related to not enough lubricant

These current listings appear in historical customer questions about sticking and extended use.

Products that appear in these entries

(Source: ok-lab's diary, published January 2020)
https://ok-lab.hatenablog.com/entry/2020/01/25/150127

(Source: ok-lab's diary, published February 2020)
https://ok-lab.hatenablog.com/entry/2020/02/29/155031

Products the diary mentioned as alternatives

The diary names no alternative.

The August and September 2022 reports concern a short resin chip supplied with an auxiliary chip. No matching product can be confirmed on the current list.

The February 2020 resin test device, January 2020 custom 10 mm assembly, and January 2026 prototype are historical configurations. No matching product can be confirmed on the current list.

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Common worries about not enough lubricant

The reader questions concern sticking, resistance, and the maker's personal choice of lubricant.

"Does a screw chip avoid sticking from dryness?"

In an entry published in January 2020, a first-time buyer asked about prolonged use and screw chips (chips with a twisted shape). Mr. Okada considered the chosen ceramic chip with a curved extension reasonable, but described drying and sticking as his leading trouble source. He thought screw shapes tended to stick less because they had less contact with the lining and did not remain against one spot.

The customer confirmed payment; the diary does not record how the chip felt in use. Mr. Okada cautioned that the absence of pain reports did not guarantee painless use.

(Source: ok-lab's diary, published January 2020)
https://ok-lab.hatenablog.com/entry/2020/01/25/150127

"Could dryness explain why my 10 mm chip won't go in?"

In an entry published in January 2020, a customer reported that a custom 10 mm vibrating assembly would not pass farther inside. Mr. Okada initially suspected the accessory arrangement, but the customer's clarification did not support that explanation. He then said dryness and internal conditions could affect progress alongside size.

A later message reported successful placement after a modification that left part of the motor exposed. Mr. Okada's advice emphasized that conditions could differ between attempts.

(Source: ok-lab's diary, published January 2020)
https://ok-lab.hatenablog.com/entry/2020/01/25/150127

"Which lubricant did Mr. Okada use with resin chips?"

In an entry published in February 2020, a customer asked which lotion, lubricant, and related equipment Mr. Okada personally used. He replied that he generally avoided lotions because they often contained preservatives. He also described a separate test in which additional lubrication changed his experience with a chip that had resisted movement.

His answer did not identify a usual lotion brand. Mr. Okada cautioned that his personal habits were unusual and might not provide a useful example for others.

(Source: ok-lab's diary, published February 2020)
https://ok-lab.hatenablog.com/entry/2020/02/29/155031

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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.