mineral · a form of Zinc
Zinc
Zinc bound to picolinic acid for enhanced absorption. Essential for immune function, wound healing, protein synthesis, DNA repair, taste/smell, and over 300 enzymatic processes.
What it’s good for
Zinc for Blurry Vision
Solid1 study · 1 supporting · 0 against
10 safety notes
Your retina holds more zinc than any other tissue, and needs it to process light.
Dose: 15–30 mg
Tested as: Zinc Oxide
Zinc for Hair Thinning
Evidence2 studies · 2 supporting · 0 against
9 safety notes
Hair follicles divide fast and need zinc to do it, and zinc also damps the hormone behind hair loss.
Dose: 15–30 mg
Tested as: Zinc Gluconate
Zinc for Acne
Evidence1 study · 1 supporting · 0 against
9 safety notes
Cuts oil production, slows the bacteria behind spots, and calms inflammation. Trials put it near low-dose antibiotics.
Dose: 30–50 mg
Tested as: zinc sulfate (oral) and zinc gluconate (oral)
Zinc for Slow Recovery
Not verified2 studies · 2 supporting · 0 against
8 safety notes
Why it gets suggested: Repair means building new tissue, and your body needs zinc to do that.
Dose: 15–30 mg
Why we could not verify it: A full sweep of PubMed clinical trial literature for zinc picolinate yields five human studies in total: a 1987 absorption-comparison study (PMID 3630857), a 2008 COPD antioxidant study (PMID 18295467), two taste-disorder trials (PMID 7562235, 12132610), and a 2019 multi-nutrient depression trial (PMID 30699842). None of these studies measures wound healing, post-illness recovery, exercise recovery, or any definition of 'slow recovery.' Every targeted query combining zinc picolinate with wound healing, muscle recovery, immune recovery, or infection returned zero results. The existing citations in the database (which tested Zinc Sulfate) are the only wound-healing zinc evidence known to exist
Zinc for Acid Reflux
Not verified1 study · 0 supporting · 0 against
10 safety notes
Why it gets suggested: Meant to toughen the lining of the gullet and stomach against acid.
Dose: 15–30 mg
Why we could not verify it: PubMed search for 'zinc picolinate' AND (reflux OR GERD OR heartburn OR gastroesophageal) returned zero results. The GERD zinc trials found in the broader literature use different zinc compounds: the Shafaghi et al. RCT (Middle East Journal of Digestive Diseases) tested zinc sulfate (220 mg capsules daily) alongside PPIs for GERD and found no benefit over PPI alone; ClinicalTrials.gov studies NCT03467438 and NCT06678997 use zinc L-carnosine (polaprezinc); NCT06664008 tests an unspecified zinc form with probiotics. None use zinc picolinate. Zinc carnosine is a distinct chemical compound with its own mechanism (mucosal cytoprotection) and is not interchangeable with zinc picolinate for evidenc
Zinc for Brittle Nails
Not verified1 study · 0 supporting · 0 against
8 safety notes
Why it gets suggested: Nail cells divide fast and need zinc to do it, and to build keratin.
Dose: 15–30 mg
Why we could not verify it: No human trial with a verifiable DOI testing zinc supplementation for brittle nails as a primary endpoint was found. The best available evidence (Scheinfeld et al. 2007, PMID 17763607) explicitly finds no support for zinc in nail health in well-nourished patients. We cannot stand behind this claim on the evidence we have, so it carries no rating.
Zinc for Frequent Colds
Not verified1 study · 1 supporting · 0 against
9 safety notes
Why it gets suggested: Your immune cells need zinc, and zinc also blocks cold viruses from entering cells.
Dose: 15–30 mg
Why we could not verify it: PubMed search for 'zinc picolinate' combined with common cold, rhinovirus, or upper respiratory infection terms returned 2 results. The first (PMID 35337174) is an in vitro experiment, not a human trial. The second (PMID 34966750, DOI 10.3389/fmed.2021.756707, confirmed) is an ambulatory case-control study testing zinc picolinate (10, 25, or 50 mg/day) for COVID-19 prevention, which is a different condition from the common cold caused by rhinoviruses and endemic coronaviruses. The 2024 Cochrane systematic review on zinc for the common cold (CD014914, 34 studies, 8526 participants) covers zinc acetate, gluconate, and other forms but does not include zinc picolinate trials. No RCT or controlle
Zinc for Bloating
Not verified1 study · 0 supporting · 0 against
9 safety notes
Why it gets suggested: Meant to tighten the seams between gut cells so less irritation gets through.
Dose: 15–30 mg
Why we could not verify it: PubMed search for 'zinc picolinate' AND (bloating OR flatulence OR abdominal distension) returned zero results. Broadening to 'zinc picolinate' AND (gastrointestinal OR gut OR bowel) returned 2 papers: one is an in vitro digestion model studying zinc bioavailability (not a clinical outcome study), and the other is an animal (rat) colitis model. The review of zinc and gastrointestinal disease (PMC4231515) covers zinc sulfate, zinc acetate, zinc chloride, zinc oxide, and zinc carnosine for conditions like diarrhea and inflammatory bowel disease — it does not study zinc picolinate for bloating and does not discuss bloating as an outcome. No human trial of zinc picolinate for bloating or functio
Other forms of Zinc
Zinc Carnosine (Polaprezinc)
A chelate of zinc and L-carnosine, used in Japan as a gastric mucosal protectant. Distinct from zinc…
Zinc Gluconate
The zinc salt used in most cold-duration lozenge trials, usually alongside zinc acetate. Trials deli…
Zinc Sulfate
An inorganic zinc salt, the form used in most wound-healing and supplementation trials. Cheaper and …