The company claims that since the zinc is run through a high pressure, low heat process, the particles in this liquid supplement are very small in size, which may make it easier for your body to absorb. Heaney R, Garland C, Baggerly C, French C, Gorham E Letter to Veugelers, P.J. and Ekwaru, J.P., A statistical error in the estimation of the recommended dietary allowance for vitamin D. Nutrients 2014, 6, 4472-4475; doi:10.3390/nu6104472 Nutrients. (2015 Mar 10) Olivares M, Wiedeman A, Bolívar L, López de Romaña D, Pizarro F Effect of increasing concentrations of zinc on the absorption of iron from iron-fortified milk Biol Trace Elem Res. (2012 Dec) Harri Hemilä Zinc lozenges may shorten the duration of colds: a systematic review Open Respir Med J. (2011) Most zinc supplements contain 15–30 mg of zinc per serving. Keep in mind the Tolerable Upper Intake Level (UL) of zinc is 40 mg per day for adults, 4–7 mg per day for infants, 7–23 mg per day for kids, and 23–34 mg per day for teens ( 1).

Serum BDNF - Ranjbar E, Shams J, Sabetkasaei M, M-Shirazi M, Rashidkhani B, Mostafavi A, Bornak E, Nasrollahzadeh J Effects of zinc supplementation on efficacy of antidepressant therapy, inflammatory cytokines, and brain-derived neurotrophic factor in patients with major depression Nutr Neurosci. (2014 Feb) Palsa Kondaiah, Puneeta Singh Yaduvanshi, Paul A Sharp, Raghu Pullakhandam Iron and Zinc Homeostasis and Interactions: Does Enteric Zinc Excretion Cross-Talk with Intestinal Iron Absorption? Nutrients. (2019 Aug 13)

Leproult R, Van Cauter E Effect of 1 week of sleep restriction on testosterone levels in young healthy men JAMA. (2011 Jun 1) Bjørklund G, Aaseth J, Skalny AV, Suliburska J, Skalnaya MG, Nikonorov AA, Tinkov AA Interactions of iron with manganese, zinc, chromium, and selenium as related to prophylaxis and treatment of iron deficiency. J Trace Elem Med Biol. (2017-May) Try to get enough vitamin D, zinc, and magnesium through your diet. However, if dietary changes prove insufficient, supplementation can help make up the difference. Ananda S Prasad Clinical, immunological, anti-inflammatory and antioxidant roles of zinc Exp Gerontol. (2008 May) Taking too much zinc can cause negative side effects, such as decreased immune function, low copper levels, and reduced HDL (good) cholesterol levels ( 1). Supplement form

Netter A, Hartoma R, Nahoul K Effect of zinc administration on plasma testosterone, dihydrotestosterone, and sperm count Arch Androl. (1981 Aug) Taking too much zinc from high dose zinc supplements can lead to symptoms such as nausea, vomiting, loss of appetite, diarrhea, abdominal cramps, and headaches. Only a few supplements have been shown to benefit testosterone production. Among those, the evidence mostly supports vitamin D and zinc, followed by magnesium. Two caveats should be kept in mind, however:

Tajar A, Forti G, O'Neill TW, Lee DM, Silman AJ, Finn JD, Bartfai G, Boonen S, Casanueva FF, Giwercman A, Han TS, Kula K, Labrie F, Lean ME, Pendleton N, Punab M, Vanderschueren D, Huhtaniemi IT, Wu FC, EMAS Group Characteristics of secondary, primary, and compensated hypogonadism in aging men: evidence from the European Male Ageing Study J Clin Endocrinol Metab. (2010 Apr) Mucositis Symptoms - Arbabi-kalati F, Arbabi-kalati F, Deghatipour M, Ansari Moghadam A Evaluation of the efficacy of zinc sulfate in the prevention of chemotherapy-induced mucositis: a double-blind randomized clinical trial Arch Iran Med. (2012 Jul)