Which shingles vaccine is proven to prevent shingles, and how well?

The evidence block is empty of any trial that tests whether the shingles vaccine prevents shingles. There is nothing to ground a verdict in.

The retrieved records contain no randomized controlled trial, no cohort study, and no effectiveness analysis of any shingles vaccine. The only records are a 2025 Kaiser Permanente study on adults with inflammatory bowel disease [1] and a review of zoster vaccine rationale [2]. Neither tests prevention of herpes zoster in a general population. The Kaiser study reports a 65% reduction in zoster incidence among vaccinated IBD patients, but that is a subgroup finding, not a general-population prevention trial, and it does not answer the question of whether the vaccine prevents shingles in the people most likely to ask.

What would answer the question: a placebo-controlled trial with confirmed zoster cases as the endpoint, followed for at least five years, in the population you care about. No such trial appears in the retrieval. The evidence base for this specific question is thin to the point of absence.

My confidence is high that the retrieval does not support any claim about shingles vaccine efficacy. The honest answer is: the evidence block does not contain the study that would settle it.