Acupuncture
Evidence: contested
The best evidence, an individual-patient-data meta-analysis, finds acupuncture beats sham needling for chronic pain, so the effect is not purely placebo. But the margin over sham is small, near the edge of clinical importance, and for some conditions sham and real needling barely differ. There is a plausible biological mechanism but genuine disagreement over whether the small specific effect is worth acting on.
Not medical advice
This is a general knowledge base, not medical or dietary advice. If you are injured, unwell or weighing up a supplement or a change to your diet, speak to a doctor, physiotherapist or registered dietitian who knows your situation.
Acupuncture inserts fine needles at defined points, in its traditional form to influence a flow of energy along meridians. That theoretical framework has no basis in anatomy or physiology, so the live question is purely empirical: does needling reduce pain by more than a convincing fake of it?
There is a real mechanism
Unlike the meridian theory, the analgesic effect of needling has a plausible physiological basis. Needling releases endogenous opioids (the body’s own endorphins and enkephalins) acting at central opioid receptors, generates adenosine acting locally at the needle site, and engages the descending pathways that damp pain signals (acupuncture mechanism review). These are measurable effects. What they establish is that a needle can produce real analgesia; what they do not establish is that inserting it at a traditional ‘acupoint’, rather than anywhere nearby, matters, which is exactly what the sham-controlled trials test.
What the best evidence shows
The strongest answer comes from the Acupuncture Trialists’ Collaboration, an individual-patient-data meta-analysis pooling tens of thousands of patients with chronic back and neck pain, osteoarthritis, headache and shoulder pain. Acupuncture was statistically superior both to no acupuncture and to sham needling, which tells against the effect being pure placebo (Vickers et al. 2018). The catch is the size of the margin over sham: roughly 0.15 to 0.23 standard deviations, small enough to sit near the threshold of what a patient would notice as clinically meaningful. Most of the total improvement a patient experiences is the large non-specific effect that the sham reproduces too.
Condition by condition the picture varies, which is part of why it is contested. For knee osteoarthritis, acupuncture beats no treatment and modestly beats sham, and is conditionally recommended by some rheumatology bodies. For migraine prevention it is slightly better than drugs but shows little or no difference from sham, with much of the benefit attributed to expectation and placebo (NCCIH acupuncture overview). Reasonable readers draw opposite conclusions from the same numbers: that acupuncture works beyond placebo, or that a margin this small over a fake needle is not worth the cost and the sessions.
Safety
Acupuncture is generally safe when delivered by a trained practitioner using sterile single-use needles. Minor effects (small bruises, brief soreness, occasional light-headedness) are common; serious events are rare and, as with dry needling, include pneumothorax from needling near the chest and, very rarely, infection (NCCIH acupuncture overview).
For runners
Most of the trial evidence is in chronic pain conditions rather than the load-related lower-limb injuries runners get, so there is little to say that acupuncture treats a runner’s Achilles, knee or shin problem specifically. A runner with chronic back or neck pain might get modest relief, in the same band as the other passive therapies and the spinal manipulation options. Dry needling, which uses the same needles aimed at muscular trigger points rather than traditional points, is the form more often offered to runners and carries its own thin evidence. For the injuries themselves, the durable treatment remains loading and load management.