Annurca Apple: A Hair-Growth Ingredient from Southern Italy, Supported by Human Clinical Research

Beyond the results of human trials, the Annurca apple has also accumulated a body of laboratory and animal-level research. These studies do not amount to proof of efficacy in humans, but they help explain why researchers have stayed interested in this apple. First, a basic fact: the life of a hair follows a "growth (anagen) — regression — resting" cycle, and hair loss often comes with a shortened growth phase and follicles entering the resting phase too early. The research directions below all revolve around this growth cycle.

The first is the hair growth phase (anagen). In cell and animal-model studies, procyanidin B2 was observed to promote the proliferation of hair epithelial cells (around 300% of control in cell studies) and to be associated with the initiation of the growth phase (Takahashi 1999; Kamimura 2002). It is worth noting that procyanidin B2, the marker compound of the Annurca apple, has also been studied at the human level — but only via the topical route: in double-blind trials lasting 4 to 12 months, topical procyanidin B2 significantly increased total hair count and hair diameter (P<0.001; Kamimura 2000; Takahashi 2001, 2005). It must be said that these were topical and used a single isolated compound, and are not equivalent to an oral whole-fruit extract — but they do show that this apple's core active has been examined at the level of the human hair follicle.

The second is keratin — the main structural protein of hair. In follicular-cell studies, Annurca apple polyphenols were observed to raise markers associated with keratin production (Badolati 2018; Piccolo 2019).

The third is antioxidant activity. The dermal papilla cells of the follicle are the key cells regulating hair growth, and oxidative stress affects how they function. In studies of follicular dermal papilla cells (in vitro), the Annurca apple extract was observed to show marked antioxidant activity (Benedetto 2024).

These research directions are each independent, and none can replace human evidence; but together they point to one thing: this apple is worth verifying with serious human trials. And what sets the Annurca apple apart is that it does, in fact, have such trials.

Back to that opening trial. De Biasio 2023 enrolled 80 people with male-pattern hair loss — half men, half women, aged 18 to 60 — randomly assigned one-to-one to an active group and a placebo group, taking 800 mg of extract daily for 180 consecutive days, followed by a 30-day follow-up after they stopped taking it; no one withdrew for any reason throughout.

The results were statistically significant (the P value for each interaction was below 0.001). At day 180, the active group's hair density rose 14%, shedding in the pull test fell 26%, shedding in the wash test fell by as much as 33%, and hair weight increased 34%; the placebo group showed no significant change at any time point. The pull test and wash test here simulate everyday shedding — the former gently pulls a bunch of hair and counts what comes away, the latter collects the hair shed during washing — two down-to-earth measures of hair loss. *Results vary from person to person.

What is more striking is how gradual and lasting the effect was. As early as day 60, density was up 7%, shedding down 13% and hair weight up 10%, deepening further at days 120 and 180; and even 30 days after stopping, the gains were largely maintained (density +12%, shedding −24% to −31%, hair weight +30%). This curve — climbing steadily, and not falling back the moment they stop taking it — is where the weight of the evidence lies.

Beyond the numbers, the participants' subjective experience pointed in the same direction. At day 180, the proportion of the active group giving a "completely positive" rating left the placebo group far behind: 80% versus 33% felt their shedding had decreased, 85% versus 40% felt their hair was stronger, 85% versus 28% rated it positively overall, and 83% versus 23% said they would buy it for its effect (median test P<0.001 for each). Objective instrument data and participants' subjective experience advancing together is an important footnote to the credibility of the evidence.

Widening the view to the whole Annurca apple extract category, that eye-catching opening figure comes from a larger trial. Tenore 2018 enrolled 250 participants and ran an 8-week study using 800 mg per day of a different Annurca apple extract, recording a 118.3% increase in hair count — from 16.4 to 35.8 hairs per square centimetre, that is, 19.4 more hairs in real terms (P=0.001); at the same time, hair weight rose 37.3% and keratin content rose 35.7% (P=0.001).

This is an increase of more than double. It must be said honestly that it comes from a different extract preparation, also in the Annurca apple category, and so is best regarded as "extract-category level" supporting evidence — corroborating the placebo-controlled trial above: one substantial in scale with a striking increase, the other rigorous in design and lasting half a year. Taken together, the human evidence for the Annurca apple is no longer a single thin data point.

Beyond efficacy, tolerability is just as important when judging a daily supplement. In De Biasio 2023, neither the active nor the placebo group had any cases of erythema, oedema or inflammation; the very mild gastrointestinal discomfort that appeared in the active group was statistically no different from the placebo group (P values of 0.41 and 0.25 respectively); and no one withdrew from the trial due to an adverse reaction. As a food-grade polyphenol extract, its microbial and heavy-metal indicators meet European Pharmacopoeia standards, with a shelf life of about 36 months.

Back to the opening numbers. The 118.3% increase in hair count, the 14% rise in density and the roughly one-third drop in shedding over the 180-day trial — these are not isolated selling points, but different facets of the same story: an apple that, from the laboratory to human trials, has accumulated layer upon layer of verifiable research.

The persuasiveness of the Annurca apple polyphenol extract has never rested on any single isolated magic number, but on the completeness of laboratory research and human RCT findings echoing one another. It is a reminder that a hair-growth ingredient truly worth trusting is built not on a slogan, but on layer upon layer of verifiable evidence stacked together. For everyone who takes their hair seriously, this science-grounded steadiness may be the most important source of confidence of all.