BL-67 (Zhi Yin) Reaching Yin

What does BL-67 Zhi Yin do?

Zhi Yin BL-67 is the Jing-Well and Metal point of the Bladder channel of Foot Tai Yang, sitting at the outer corner of the little toenail — the very last point of the longest channel in the body — and it is best known for one recorded action that almost no other point claims: it turns the fetus. Sacred Lotus sources & references carry two groups of actions for it, and they look unrelated until the channel is taken into account. The Bladder channel begins at the inner corner of the eye and runs over the head, down the whole back, and finishes here; so a point at the tip of the smallest toe is the classical distal choice for the far end of that channel, at the head and the eyes.

• Turns the fetus and facilitates labour — the action for which the point is famous, recorded in our own data and in the standard reference literature. It is the reason BL-67 is the single most-studied acupuncture point in obstetrics, and it is set out in full under research below.
• Expels wind and clears the head and the eyes — the other recorded action, and the one that follows from the channel. It is used for headache at the back and top of the head, for nasal congestion and nosebleed, and for painful or obstructed eyes.
• Clears heat and opens the orifices — the general property of Jing-Well points, which the classics assign to fullness below the heart and to disturbances of consciousness; the whole Jing-Well group shares this.
• Activates the channel — locally, for pain and heat in the sole of the foot and the little toe, the last few inches of the channel's own territory.

Why does being the Jing-Well and Metal point matter here?

The five transporting points describe channel qi as water: it wells up at the Jing-Well at the tip of the digit, glides at the Ying-Spring, pours at the Shu-Stream, flows at the Jing-River and enters the deep at the He-Sea. The Nan Jing assigns the Jing-Well points to fullness below the heart, and later practice extended them to acute disturbance of consciousness and to reversing the direction of a channel. The element assignment adds the second half: on yang channels the Jing-Well point is a Metal point, and the Bladder is a yang Water channel, so BL-67 is the Metal point on a Water channel. Metal is the mother of Water in the generating sequence, which makes BL-67 the tonification point of the Bladder — the classical choice when the channel itself is judged deficient. Our own record gives the classification as Jing-Well & Metal Point.

Source: Sacred Lotus sources & references (channel, five-shu and element classifications; existing action and use records); Deadman & Al-Khafaji, A Manual of Acupuncture (p. 325); Chinese Acupuncture & Moxibustion (p. 191); Nan Jing (Classic of Difficulties), on the five-shu indications; cross-referenced against multiple online sources.

What is BL-67 Zhi Yin used for?

Zhi Yin BL-67 is used above all for malposition of the fetus — breech presentation in late pregnancy — and for difficult labour and retained placenta; and quite separately for headache, nasal obstruction, nosebleed and eye pain at the head end of the Bladder channel. The indications carried in Sacred Lotus sources & references are listed below and cross-checked against the standard reference literature. They describe traditional use, not proven treatment; where modern trials exist, they are set out under research rather than implied here.

• Malposition of the fetus, including breech presentation
• Difficult or obstructed labour
• Retained placenta (recorded as detention of the afterbirth)
• Headache, particularly at the back and vertex of the head
• Nasal obstruction and blocked nose
• Nosebleed (epistaxis)
• Eye pain and disorders of the eye
• Feverish sensation in the sole of the foot
• Pain of the little toe and the outer edge of the foot
• Toothache (recorded in our own use record)
• Rigidity of the neck and stiffness along the Bladder channel
• Febrile disease without sweating

Source: Sacred Lotus sources & references (existing indication and use records); Deadman & Al-Khafaji, A Manual of Acupuncture (p. 325); Chinese Acupuncture & Moxibustion (p. 191).

Where is BL-67 Zhi Yin, and how is it used in practice?

Zhi Yin sits at the outer corner of the nail of the little toe — the corner furthest from the other toes — about a tenth of a cun back from the angle where the side edge of the nail meets its base. That is roughly a nail's thickness away from the corner itself, on the skin rather than the nail. It is the final point of the Bladder channel, and the last point on a route that starts beside the eye and covers the whole length of the back.

Our two location records agree closely and are retained unchanged: one places it on the lateral side of the small toe about 0.1 cun from the corner of the nail, the other at the meeting of lines drawn along the lateral border and the base of the nail. No discrepancy arises between them, and nothing found in the reference literature conflicts with either.

Which points is BL-67 combined with?

• For turning a breech-presenting fetus — the modern clinical protocols use BL-67 alone, bilaterally, with heat rather than needles. That is worth saying plainly, because it is unusual: this is one of the few points whose principal recorded use is documented as a single-point treatment. Where acupuncture has been added alongside the heat in trials, the additional points have varied and no standard combination has emerged.
• With SP-06 San Yin Jiao and LI-04 He Gu — the classical pairing for expediting a difficult labour, the two points that carry the strongest downward-and-moving reputation in the tradition, joined to BL-67. All three are held in this library, and all three carry pregnancy cautions for exactly the same reason.
• With BL-60 Kun Lun — its own channel's other labour-associated point, and its neighbour in the traditional lists of points avoided in pregnancy. BL-60 is recorded here as promoting labour and treating difficult labour, so the two share both the action and the caution.
• With BL-10 Tian Zhu and GB-20 Feng Chi — for headache and neck rigidity, joining the far distal point to the local points at the base of the skull. This is the classic "opposite ends of the channel" selection.
• With BL-01 Jing Ming and LI-20 Ying Xiang — for the eye and nose indications, the head end of the channel treated locally with BL-67 distally.
• Along its own channel — BL-66 Tong Gu, the Ying-Spring and Water point, lies just proximal on the outer edge of the foot, and BL-65 Shu Gu, the Shu-Stream and Wood point, above that; the three make the foot group of the channel.

Where does BL-67 sit among its category peers?

Every one of the twelve Jing-Well points is held in Sacred Lotus sources & references, and the set is worth learning together — they sit at the tips of the fingers and toes, they are all shallow, and the classics treat them as a group for acute and consciousness-related presentations:

• Jing-Well & Metal (the yang channels) — LI-01 Shang Yang, ST-45 Li Dui, SI-01 Shao Ze, BL-67 Zhi Yin, SJ-01 Guan Chong, GB-44 Zu Qiao Yin
• Jing-Well & Wood (the yin channels) — LU-11 Shao Shang, SP-01 Yin Bai, HT-09 Shao Chong, KI-01 Yong Quan, P-09 Zhong Chong, LIV-01 Da Dun

Within that group BL-67 is the outlier, and instructively so. The other eleven are used chiefly for acute, sudden and heat presentations; BL-67 alone carries a specific obstetric use, applied over days rather than in an emergency, and delivered with heat rather than a needle. It is also worth noting that KI-01 Yong Quan, the Jing-Well point of the paired Kidney channel, sits on the sole of the same foot — the two ends of the interior–exterior pair a few inches apart.

Source: Sacred Lotus sources & references (location, categories and cross-referenced point records — the full set of twelve Jing-Well points queried from our own holdings); Deadman & Al-Khafaji, A Manual of Acupuncture (p. 325); Chinese Acupuncture & Moxibustion (p. 191); cross-referenced against multiple online sources.

Where is BL-67 located?

• A Manual of Acupuncture (p. 325): On the dorsal aspect of the little toe, at the junction of lines drawn along the lateral border of the nail and the base of the nail, approximately 0.1 cun from the corner of the nail.
• Chinese Acupuncture and Moxibustion (p. 191): On the lateral side of the small toe, about 0.1 cun from the corner of the nail.

How is BL-67 Zhi Yin needled, and why is it both contraindicated in pregnancy and used for breech presentation?

Stated plainly, because this is the single most important thing on the page: our own needling record states that acupuncture at BL-67 is contraindicated in pregnant women, and our own action record states that the point turns the fetus and facilitates labour. Both are correct, and they are not in conflict. The prohibition is on needling the point during pregnancy; the documented exception is the application of heat — moxibustion — late in pregnancy to correct a breech presentation, and the use of the point at term to assist labour. Everything below records what the standard texts document. It is not instruction, and this page does not teach technique. Needling and moxibustion are carried out only by a qualified, licensed practitioner.

The angle and depth the texts record

• Sacred Lotus sources & references — superficial puncture of about 0.1 inch; moxibustion applicable.
• Deadman & Al-Khafaji (p. 325) and Chinese Acupuncture & Moxibustion (p. 191) record a comparable shallow insertion of roughly 0.1 cun, and both document bleeding the point as an alternative technique — a method common to the Jing-Well points as a group. Moxibustion is recorded as applicable and, at this point, is the principal documented method.
• Depth is set by anatomy, not by hazard. There is skin, a thin layer of subcutaneous tissue and then the distal phalanx of the little toe. Nothing else is within reach. The dorsal digital nerve and the small digital vessels supply the area, which is why the point is sharply sensitive and why it bleeds readily — both are ordinary documented occurrences rather than complications.

The pregnancy question, set out properly

This deserves careful handling, because a reader who takes only half of it away will have the point exactly backwards.

• What the tradition prohibits. BL-67 appears in the classical lists of points forbidden during pregnancy, and our own needling record carries that prohibition in the same terms. The rationale is internally consistent and is the same one that applies to BL-60, LI-04 and SP-06: a point credited with moving the fetus and hastening delivery is a point the tradition does not want stimulated at a stage when neither is wanted.
• What the tradition nevertheless uses it for. The same texts record BL-67 as the point for correcting malposition of the fetus and for difficult labour. The prohibition and the indication describe one property viewed from two moments in a pregnancy. This is the same inversion recorded here at BL-60 Kun Lun, and it is characteristic of the whole group of labour-associated points.
• The modality matters, and this is the part most often lost. The classical prohibition attaches to needling. What is used for breech correction, and what every substantial modern trial has tested, is moxibustion — a moxa stick of Artemisia held near the point so that it warms the skin without contact. The trials applied it bilaterally, typically for fifteen to twenty minutes daily over one to two weeks, at a gestational age of roughly 32 to 35 weeks. Reading the evidence as though it endorsed needling the point in pregnancy would misrepresent it.
• Timing matters too. The trial protocols begin at around 33 weeks, when a breech presentation becomes clinically relevant and there is still room for the fetus to turn. Nothing in that literature concerns earlier pregnancy, and it should not be read across to it.
• What the modern literature says about "forbidden points" as a class. The question was argued openly in the peer-reviewed acupuncture literature in 2011. A review of the historical use of contraindicated points, of the physiology of pregnancy and of how these points behaved in trials found recommendations ranging from complete avoidance to the position that they are not contraindicated in a normal pregnancy, and called for practitioner judgement rather than a blanket rule (Betts D, Budd S, Acupunct Med 2011;29(2):137–9, PMID 21444295). A companion paper from an obstetrics department concluded that the published literature does not support an abortifacient effect (da Silva AV et al., Acupunct Med 2011;29(2):135–6, PMID 21422007), and an accompanying commentary examined each proposed mechanism and found no plausible physiological basis for the risk (Cummings M, Acupunct Med 2011;29(2):140–2, PMID 21617035). This page records the contraindication as fact and the debate as fact, and does not present either as settled.

Adverse events actually reported

The Cochrane review of moxibustion for breech presentation reported that adverse events were inadequately recorded in most trials, and that in the single study that reported them in a re-analysable form the events were nausea, unpleasant odour, abdominal pain and uterine contractions — with the review authors rating the certainty of that comparison as very low (Coyle ME, Smith C, Peat B, Cochrane Database Syst Rev 2023;5:CD003928, PMID 37158339). The largest sham-controlled trial reported no severe adverse effects during treatment (Vas J et al., Acupunct Med 2013;31(1):31–8, PMID 23249535). Smoke and odour from moxa are a practical consideration in their own right, and have been studied as such.

Setting the pregnancy question aside, BL-67 is otherwise a low-hazard point: it lies on the tip of a toe with no cavity, organ or major vessel anywhere near it. For general context, a meta-analysis of prospective clinical studies estimated serious adverse events from acupuncture at approximately 1 per 10,000 patients and around 8 per million treatments (Bäumler P et al., BMJ Open 2021;11:e045961, PMID 34489268); the serious events in that literature cluster at a small number of points over the chest, upper back and root of the neck, and BL-67 is nowhere near them.

Source: Sacred Lotus sources & references (existing needling, action and use records — the pregnancy contraindication and the fetus-turning action were both confirmed by query, not from memory); Deadman & Al-Khafaji, A Manual of Acupuncture (p. 325); Chinese Acupuncture & Moxibustion (p. 191); PubMed PMID 37158339, 23249535, 21444295, 21422007, 21617035, 34489268 — each checked as active, with no retraction, erratum or expression of concern.

What does the name Zhi Yin mean?

Zhi Yin means "Reaching Yin" — zhi, to arrive at or reach, and yin, the yin of the yin–yang pair. The name is a description of the point's position in the circulation of qi rather than of anything anatomical. The Bladder channel is the great yang (Tai Yang) channel of the foot; it ends here, and here the qi passes over into the Kidney channel, which is the lesser yin (Shao Yin) channel of the foot. So this is the place at which yang reaches yin and becomes it. Read that way, the name is a map reference: the last inch of yang.

A second reading found in the commentaries takes yin in its bodily sense — the lower and inner parts of the body, and by extension the womb — and reads the name as pointing to the point's reach into the deepest yin region from the furthest yang extremity. Both readings are traditional; the site does not choose between them, though the first is the more widely given and the more consistent with the channel system.

Is there research on BL-67 Zhi Yin?

Yes — and this is the unusual case. BL-67 has a genuine, substantial and independently replicated modern evidence base, centred entirely on one use: moxibustion to correct breech presentation in late pregnancy. It is probably the most-studied single acupuncture point in obstetrics, and it is the subject of a current Cochrane systematic review. Because this site is as careful about good evidence as about weak evidence, what follows names exactly what was studied, in whom, against what comparator, and with what certainty the reviewers graded it.

The systematic review evidence

• Cochrane review, 2023 update — the best available synthesis. Cephalic version by moxibustion for breech presentation reviewed 13 randomised or quasi-randomised trials in 2,181 women with a singleton breech presentation. Compared with usual care alone, moxibustion plus usual care probably reduces the chance of non-cephalic presentation at birth (7 trials, 1,152 women; risk ratio 0.87, 95% CI 0.78 to 0.99; moderate-certainty evidence by GRADE). Compared with sham moxibustion plus usual care, moxibustion probably reduces non-cephalic presentation at birth (1 trial, 272 women; RR 0.74, 95% CI 0.58 to 0.95; moderate certainty). The review also found that moxibustion plus usual care probably makes little or no difference to the caesarean-section rate (6 trials, 1,030 women; RR 0.94, 95% CI 0.83 to 1.05; moderate certainty), that the evidence on the need for external cephalic version is very uncertain (4 trials, 692 women; RR 0.62, 95% CI 0.32 to 1.21; low certainty), and that adverse events were inadequately reported in most trials. One trial (260 women) found a probable reduction in the use of oxytocin (RR 0.28, 95% CI 0.13 to 0.60; moderate certainty). Coyle ME, Smith C, Peat B, Cochrane Database Syst Rev 2023;5(5):CD003928, PMID 37158339, DOI 10.1002/14651858.CD003928.pub4. This is the fourth version of a review first published in 2005; it is current and has not been withdrawn, which was checked directly rather than assumed. The superseded 2012 version remains on record as PMID 22592693.
• Earlier meta-analysis. A systematic review of six trials in 1,087 women, searching Western and Chinese databases to 2007, reported cephalic version in 72.5% of the moxibustion group against 53.2% of controls (RR 1.36, 95% CI 1.17 to 1.58; number needed to treat 5), while noting considerable heterogeneity and urging caution (Vas J et al., Am J Obstet Gynecol 2009;201(3):241–59, PMID 19733275).

The individual trials that matter

• The trial that started it — Cardini & Weixin, 1998. An open randomised controlled trial in two Chinese hospitals enrolled 260 first-time mothers at 33 weeks with an ultrasound-confirmed breech presentation. The intervention group received moxibustion at BL-67 for seven days, extended by a further seven if the fetus remained breech. At 35 weeks, 75.4% of fetuses in the intervention group were cephalic against 47.7% of controls (RR 1.58, 95% CI 1.29 to 1.94), and at delivery 75.4% against 62.3% (RR 1.21, 95% CI 1.02 to 1.43). Mothers in the intervention group also counted more fetal movements. Cardini F, Weixin H, JAMA 1998;280(18):1580–4, PMID 9820259. Open-label, and conducted in a setting where moxibustion is culturally familiar — both of which matter for how far it generalises.
• The largest sham-controlled trial — Vas et al., 2013. A multicentre randomised controlled trial in Spanish primary care randomised 406 low-risk pregnant women with an ultrasound-confirmed breech presentation at 33 to 35 weeks to true moxibustion at BL-67 plus usual care, sham moxibustion at a non-specific point plus usual care, or usual care alone. Cephalic presentation at birth was reached in 58.1% of the true-moxibustion group, against 43.4% with sham (RR 1.34, 95% CI 1.05 to 1.70) and 44.8% with usual care alone (RR 1.29, 95% CI 1.02 to 1.64); the number needed to treat was 8. No severe adverse effects were reported. Vas J et al., Acupunct Med 2013;31(1):31–8, PMID 23249535, ISRCTN10634508. This is the sham-controlled comparison that carries the moderate-certainty rating in the Cochrane review, and it is the strongest single piece of evidence the point has. Note the design detail that makes it a point-specificity study as well as an efficacy study: the sham arm received identical moxibustion at SP-01 Yin Bai, a real acupuncture point on the other side of the same foot, which is held in this library. The comparison was therefore between two points, not between moxa and nothing.
• The replication that did not confirm it — Cardini et al., 2005. A single-blind randomised trial across six Italian obstetric departments attempted the same protocol in a non-Chinese population. It was stopped after 123 of a planned 265 participants because of a high rate of treatment interruption, and at that point found no difference in cephalic presentation at 35 weeks (34% against 36%; RR 0.95, 99% CI 0.59 to 1.5). The authors were explicit that the result supports neither the effectiveness nor the ineffectiveness of the treatment, and that the difficulty lay in transferring a traditional therapy across cultural contexts — adherence, not physiology. Cardini F et al., BJOG 2005;112(6):743–7, PMID 15924530. It belongs in any honest account of this point.
• Acupressure rather than heat. An unblinded two-arm randomised trial in Iran applied acupressure at BL-67 bilaterally for ten minutes daily over two weeks in 138 women at 32 to 35 weeks, reporting spontaneous cephalic rotation in 82.6% of the intervention group against 17.4% of controls (Hamidzadeh A et al., Explore (NY) 2022;18(5):567–72, PMID 34764014). The effect size is far larger than anything in the moxibustion literature and the trial was unblinded, so it is listed for completeness rather than weighted heavily.

Reading the evidence honestly

The defensible summary is narrow and worth stating exactly. Moxibustion at BL-67 in late pregnancy probably increases the chance that a breech-presenting fetus is head-down at birth, on moderate-certainty evidence including one good sham-controlled trial. It probably does not change the caesarean-section rate, on evidence of the same certainty — which is the outcome most women would care about, and the honest limit of the claim. Its effect on the need for external cephalic version is uncertain. Adverse-event reporting across the literature is poor. And a serious European replication failed, for reasons of adherence rather than biology. Everything outside breech presentation — the headache, nose and eye indications — rests on traditional use, not on trials.

Has any research on this point been retracted?

Retraction status was checked for every identifier cited on this page, and all are clean — no retractions, errata or expressions of concern attach to the Cochrane review, the JAMA trial, the Vas multicentre trial, the BJOG replication or the acupressure trial. It is worth recording that the check was made: the acupuncture literature does contain retracted work, and a source line is only worth as much as the verification behind it.

How does Zhi Yin compare with the points around it?

BL-66 Tong Gu, the Ying-Spring and Water point, lies just proximal on the outer edge of the little toe, and BL-65 Shu Gu, the Shu-Stream and Wood point, above that; both are weighted toward headache and heat rather than obstetrics. KI-01 Yong Quan is the Jing-Well point of the paired Kidney channel and sits on the sole of the same foot — the interior–exterior pair meeting at the two ends of one toe's worth of distance. GB-44 Zu Qiao Yin is the Jing-Well and Metal point of the Gall Bladder channel at the fourth toenail, one toe over, and is the point most easily confused with BL-67 by position alone. BL-60 Kun Lun at the ankle is its channel-mate in the pregnancy-caution lists and in the difficult-labour indication. Among all of these, BL-67 is distinguished by having something none of them has: a specific obstetric use, tested in randomised trials and graded by a current Cochrane review.

Source: Sacred Lotus sources & references (name, categories and cross-referenced point records); Deadman & Al-Khafaji, A Manual of Acupuncture (p. 325); Chinese Acupuncture & Moxibustion (p. 191); Nan Jing, on the five-shu points; PubMed PMID 37158339 (Cochrane 2023, current), 22592693 (superseded 2012 version), 19733275, 9820259, 23249535, 15924530, 34764014 — each verified resolvable and checked for retraction, erratum and expression of concern, all clean; cross-referenced against multiple online sources.