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Grand View Research. (2023). Collagen market size, share & trends analysis report by source (bovine, porcine), by application (food & beverages, healthcare), by form, by type, by product, by region & segment forecasts, 2024 - 2030. Retrieved from 

https://www.grandviewresearch.com/industry-analysis/collagen-market

Cleveland Clinic. (2022, May 23). Collagen. Cleveland Clinic. Retrieved from 

https://my.clevelandclinic.org/health/articles/23089-collagen

Harvard T.H. Chan School of Public Health. (2021, May). Collagen. The Nutrition Source. Retrieved from 

https://nutritionsource.hsph.harvard.edu/collagen/

Bolke, L., Schlippe, G., Gerß, J., & Voss, W. (2019). A Collagen Supplement Improves Skin Hydration, Elasticity, Roughness, and Density: Results of a Randomized, Placebo-Controlled, Blind Study. Nutrients, 11(10), 2494. 

Trehan, A., Anand, R., Chaudhary, G., Garg, H., & Verma, M. K. (2024). Efficacy and Safety of Skin Radiance Collagen on Skin and Hair Matrix: A Placebo-Controlled Clinical Trial in Healthy Human Subjects. Clinical, cosmetic and investigational dermatology, 17, 581–591. 

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Tang, B. M., Eslick, G. D., Nowson, C., Smith, C., & Bensoussan, A. (2007). Use of calcium or calcium in combination with vitamin D supplementation to prevent fractures and bone loss in people aged 50 years and older: a meta-analysis. Lancet (London, England), 370(9588), 657–666. 

https://doi.org/10.1016/S0140-6736(07)61342-7

Reid, I. R., Mason, B., Horne, A., Ames, R., Reid, H. E., Bava, U., Bolland, M. J., & Gamble, G. D. (2006). Randomized controlled trial of calcium in healthy older women. The American journal of medicine, 119(9), 777–785. 

https://doi.org/10.1016/j.amjmed.2006.02.038

Li, K., Wang, X. F., Li, D. Y., Chen, Y. C., Zhao, L. J., Liu, X. G., Guo, Y. F., Shen, J., Lin, X., Deng, J., Zhou, R., & Deng, H. W. (2018). The good, the bad, and the ugly of calcium supplementation: a review of calcium intake on human health. Clinical interventions in aging, 13, 2443–2452. 

Office of Dietary Supplements - calcium. (n.d.). Retrieved from 

https://ods.od.nih.gov/factsheets/Calcium-HealthProfessional/

Van Summeren, M. J. H., Braam, L. a. J. L. M., Lilien, M. R., Schurgers, L. J., Kuis, W., & Vermeer, C. (2009). The effect of menaquinone-7 (vitamin K2) supplementation on osteocalcin carboxylation in healthy prepubertal children. British Journal of Nutrition, 102(8), 1171–1178. 

https://doi.org/10.1017/s0007114509382100

Inaba, N., Sato, T., & Yamashita, T. (2015). Low-Dose Daily Intake of Vitamin K<sub>2</sub> (Menaquinone-7) Improves Osteocalcin &gamma;-Carboxylation: A Double-Blind, Randomized Controlled Trials. Journal of Nutritional Science and Vitaminology, 61(6), 471–480. 

Mandatori, D., Pelusi, L., Schiavone, V., Pipino, C., Di Pietro, N., & Pandolfi, A. (2021b). The dual role of Vitamin K2 in “Bone-Vascular Crosstalk”: opposite effects on bone loss and vascular calcification. Nutrients, 13(4), 1222. 

Office of Dietary Supplements - Vitamin D. (n.d.). Retrieved from 

https://ods.od.nih.gov/factsheets/VitaminD-HealthProfessional/

Khazai, N., Judd, S. E., & Tangpricha, V. (2008). Calcium and vitamin D: skeletal and extraskeletal health. Current rheumatology reports, 10(2), 110–117. 

https://doi.org/10.1007/s11926-008-0020-y

Kunutsor, S. K., Whitehouse, M. R., Blom, A. W., & Laukkanen, J. A. (2017). Low serum magnesium levels are associated with increased risk of fractures: a long-term prospective cohort study. European Journal of Epidemiology, 32(7), 593–603. 

https://doi.org/10.1007/s10654-017-0242-2

Al Alawi, A. M., Majoni, S. W., & Falhammar, H. (2018). Magnesium and Human Health: Perspectives and Research Directions. International journal of endocrinology, 2018, 9041694. 

Rondanelli, M., Faliva, M. A., Peroni, G., Infantino, V., Gasparri, C., Iannello, G., Perna, S., Riva, A., Petrangolini, G., & Tartara, A. (2020). Pivotal role of boron supplementation on bone health: A narrative review. Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS), 62, 126577. 

https://doi.org/10.1016/j.jtemb.2020.126577

Nakano, M., Nakamura, Y., Miyazaki, A., & Takahashi, J. (2021). Zinc Pharmacotherapy for Elderly Osteoporotic Patients with Zinc Deficiency in a Clinical Setting. Nutrients, 13(6), 1814. 

Molenda, M., & Kolmas, J. (2023). The role of zinc in bone tissue health and regeneration—a review. Biological Trace Element Research, 201(12), 5640–5651. 

https://doi.org/10.1007/s12011-023-03631-1

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Abbasi, B., Kimiagar, M., Sadeghniiat, K., Shirazi, M. M., Hedayati, M., & Rashidkhani, B. (2012 December). The effect of magnesium supplementation on primary insomnia in elderly: A double-blind placebo-controlled clinical trial. Journal of research in medical sciences : the official journal of Isfahan University of Medical Sciences. Retrieved from 

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3703169/

Cropley, M., Cave, Z., Ellis, J., & Middleton, R. W. (2002). Effect of kava and valerian on human physiological and psychological responses to mental stress assessed under laboratory conditions. Phytotherapy research : PTR, 16(1), 23–27. 

Edwards, D., Heufelder, A., & Zimmermann, A. (2012). Therapeutic effects and safety of Rhodiola rosea extract WS® 1375 in subjects with life-stress symptoms--results of an open-label study. Phytotherapy research : PTR, 26(8), 1220–1225. 

Gomaa, A. M., Galal, H. M., & Abou-Elgait, A. T. (2017 April 15). Neuroprotective effects of melatonin administration against chronic immobilization stress in rats. International journal of physiology, pathophysiology and pharmacology, 9(2), 16–27. Retrieved from 

https://pubmed.ncbi.nlm.nih.gov/28533888/

Hidese, S., Ogawa, S., Ota, M., Ishida, I., Yasukawa, Z., Ozeki, M., & Kunugi, H. (2019). Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial. Nutrients, 11(10), 2362. 

Hinton, T., Jelinek, H. F., Viengkhou, V., Johnston, G. A., & Matthews, S. (2019). Effect of GABA-Fortified Oolong Tea on Reducing Stress in a University Student Cohort. Frontiers in nutrition, 6, 27. 

Kennedy, D. O., Little, W., & Scholey, A. B. (2004). Attenuation of laboratory-induced stress in humans after acute administration of Melissa officinalis (Lemon Balm). Psychosomatic medicine, 66(4), 607–613. 

https://doi.org/10.1097/01.psy.0000132877.72833.71

Mahdavifar, B., Hosseinzadeh, M., Salehi-Abargouei, A., Mirzaei, M., & Vafa, M. (2021). Dietary intake of B vitamins and their association with depression, anxiety, and stress symptoms: A cross-sectional, population-based survey. Journal of affective disorders, 288, 92–98. 

https://doi.org/10.1016/j.jad.2021.03.055

Remenapp, A., Coyle, K., Orange, T., Lynch, T., Hooper, D., Hooper, S., Conway, K., & Hausenblas, H. A. (2022). Efficacy of Withania somnifera supplementation on adult's cognition and mood. Journal of Ayurveda and integrative medicine, 13(2), 100510. 

https://doi.org/10.1016/j.jaim.2021.08.003

Stough, C., Scholey, A., Lloyd, J., Spong, J., Myers, S., & Downey, L. A. (2011). The effect of 90 day administration of a high dose vitamin B-complex on work stress. Human psychopharmacology, 26(7), 470–476. 

US Centers for Disease Control and Prevention. (2024 May 21). Coping with stress. CDC. Retrieved from 

https://www.cdc.gov/mentalhealth/cope-with-stress/index.html

Zogovic D, Pesic V, Dmitrasinovic G, Dajak M, Plecas B, Batinic B, et al. (2014). Pituitary-gonadal, pituitary-adrenocortical hormones and IL-6 levels following long-term magnesium supplementation in male students. J Med Biochem. Retrieved from 

https://www.dmbj.org.rs/jmb/pdf/2014-3/9.pdf

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Sandi, C., Woodson, J. C., Haynes, V. F., Park, C. R., Touyarot, K., Lopez-Fernandez, M. A., Venero, C., & Diamond, D. M. (2005). Acute stress-induced impairment of spatial memory is associated with decreased expression of neural cell adhesion molecule in the hippocampus and prefrontal cortex. Biological psychiatry, 57(8), 856–864. 

https://doi.org/10.1016/j.biopsych.2004.12.034

Sam, C., & Bordoni, B. (2023). Physiology, acetylcholine. StatPearls - NCBI Bookshelf. Retrieved from 

https://www.ncbi.nlm.nih.gov/books/NBK557825/

National Toxicology Program. (2020). Introduction. NTP Developmental and Reproductive Toxicity Technical Report on the Prenatal Development Studies of Dimethylaminoethanol Bitartrate (CASRN 5988-51-2) in Sprague Dawley (Hsd:Sprague Dawley® SD®) Rats (Gavage Studies) - NCBI Bookshelf. Retrieved from 

https://www.ncbi.nlm.nih.gov/books/NBK562906/

Wurtman R. J. (2014). A nutrient combination that can affect synapse formation. Nutrients, 6(4), 1701–1710. 

Yuan, G., An, L., Sun, Y., Xu, G., & Du, P. (2018). Improvement of Learning and Memory Induced by Cordyceps Polypeptide Treatment and the Underlying Mechanism. Evidence-based complementary and alternative medicine : eCAM, 2018, 9419264. 

Wang, Z., Zhu, W., Xing, Y., Jia, J., & Tang, Y. (2022). B vitamins and prevention of cognitive decline and incident dementia: a systematic review and meta-analysis. Nutrition reviews, 80(4), 931–949. 

Barkats, M., Venault, P., Christen, Y., & Cohen-Salmon, C. (1995). Effect of long-term treatment with EGb 761 on age-dependent structural changes in the hippocampi of three inbred mouse strains. Life sciences, 56(4), 213–222. 

https://doi.org/10.1016/0024-3205(94)00915-5

Ribeiro, M. L., Moreira, L. M., Arçari, D. P., Dos Santos, L. F., Marques, A. C., Pedrazzoli, J., Jr, & Cerutti, S. M. (2016). Protective effects of chronic treatment with a standardized extract of Ginkgo biloba L. in the prefrontal cortex and dorsal hippocampus of middle-aged rats. Behavioural brain research, 313, 144–150. 

https://doi.org/10.1016/j.bbr.2016.06.029

Morgan, A., & Stevens, J. (2010). Does Bacopa monnieri improve memory performance in older persons? Results of a randomized, placebo-controlled, double-blind trial. Journal of alternative and complementary medicine (New York, N.Y.), 16(7), 753–759. 

Pase, M. P., Kean, J., Sarris, J., Neale, C., Scholey, A. B., & Stough, C. (2012). The cognitive-enhancing effects of Bacopa monnieri: a systematic review of randomized, controlled human clinical trials. Journal of alternative and complementary medicine (New York, N.Y.), 18(7), 647–652. 

Loong, S., Barnes, S., Gatto, N. M., Chowdhury, S., & Lee, G. J. (2023). Omega-3 fatty acids, cognition, and brain volume in older adults. Brain Sciences, 13(9), 1278. 

Kato-Kataoka, A., Sakai, M., Ebina, R., Nonaka, C., Asano, T., & Miyamori, T. (2010). Soybean-Derived Phosphatidylserine Improves Memory Function of the Elderly Japanese Subjects with Memory Complaints. Journal of Clinical Biochemistry and Nutrition, 47(3), 246–255. 

Wang, R., Yan, H., & Tang, X. (2006). Progress in studies of huperzine A, a natural cholinesterase inhibitor from Chinese herbal medicine1. Acta Pharmacologica Sinica, 27(1), 1–26. 

https://doi.org/10.1111/j.1745-7254.2006.00255.x

Glickstein, M., & May, J. G. (1995). Visual control of movement. In Contributions to sensory physiology (pp. 103–145). 

https://doi.org/10.1016/b978-0-12-151807-3.50010-0

Vigna, L., Morelli, F., Agnelli, G. M., Napolitano, F., Ratto, D., Occhinegro, A., Di Iorio, C., Savino, E., Girometta, C., Brandalise, F., & Rossi, P. (2019). Hericium erinaceus Improves Mood and Sleep Disorders in Patients Affected by Overweight or Obesity: Could Circulating Pro-BDNF and BDNF Be Potential Biomarkers?. Evidence-based complementary and alternative medicine : eCAM, 2019, 7861297. 

Martínez-Mármol, R., Chai, Y., Khan, Z., Kim, S. B., Hong, S. M., Gormal, R. S., Lee, D. H., Lee, J. K., Lee, M. K., Kim, S. Y., & Meunier, F. A. (2020). Hericerin derivatives from Hericium erinaceus exert BDNF-like neurotrophic activity in central hippocampal neurons and enhance memory. bioRxiv (Cold Spring Harbor Laboratory). 

https://doi.org/10.1101/2020.08.28.271676

Ma, G. P., Zheng, Q., Xu, M. B., Zhou, X. L., Lu, L., Li, Z. X., & Zheng, G. Q. (2018). Rhodiola rosea L. Improves Learning and Memory Function: Preclinical Evidence and Possible Mechanisms. Frontiers in pharmacology, 9, 1415. 

Xing, D., Yoo, C., Gonzalez, D., Jenkins, V., Nottingham, K., Dickerson, B., Leonard, M., Ko, J., Faries, M., Kephart, W., Purpura, M., Jäger, R., Sowinski, R., Rasmussen, C. J., & Kreider, R. B. (2022). Effects of acute ashwagandha ingestion on cognitive function. International Journal of Environmental Research and Public Health/International Journal of Environmental Research and Public Health, 19(19), 11852. 

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Reider, C. A., Chung, R.-Y., Devarshi, P. P., Grant, R. W., & Mitmesser, S. H. (2020). Inadequacy of immune health nutrients: Intakes in US adults, the 2005–2016 NHANES. Nutrients, 12(6), 1735. Retrieved from 

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7352522/

Office of Dietary Supplements. (2020). Dietary supplements for immune function and infectious diseases: Fact sheet for health professionals. National Institutes of Health. Retrieved from 

https://ods.od.nih.gov/factsheets/ImmuneFunction-HealthProfessional/#:~:text=Consuming%20adequate%20amounts%20of%20several,5%2C8%2D10%5D

Nicholson, L. B. (2016). The immune system. Essays in Biochemistry, 60(3), 275-301. Retrieved from 

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5091071/

Maggini, S., Wintergerst, E. S., Beveridge, S., & Hornig, D. H. (2007). Selected vitamins and trace elements support immune function by strengthening epithelial barriers and cellular and humoral immune responses. British Journal of Nutrition, 98(S1), S29-S35. Retrieved from 

https://www.cambridge.org/core/journals/british-journal-of-nutrition/article/selected-vitamins-and-trace-elements-support-immune-function-by-strengthening-epithelial-barriers-and-cellular-and-humoral-immune-responses/94B772EB747D1E5CD9FAC8F90937AA9F

Office of Dietary Supplements. (2016). Dietary supplements for immune function and infectious diseases fact sheet for health professionals. National Institutes of Health. Retrieved from 

https://ods.od.nih.gov/factsheets/ImmuneFunction-HealthProfessional/

Wessels, I., Rolles, B., & Rink, L. (2020). The potential impact of zinc supplementation on COVID-19 pathogenesis. Frontiers in Immunology, 11, 1712. Retrieved from 

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7365891/

National Institutes of Health, Office of Dietary Supplements. (2023). Vitamin A and carotenoids: Fact sheet for health professionals. Retrieved from 

https://ods.od.nih.gov/factsheets/VitaminA-HealthProfessional/

Maggini, S., Maldonado, P., Cardim, P., Fernandez Newball, C., & Sota Latino, E. R. (2017). Vitamins C, D and zinc: Synergistic roles in immune function and infections. Vitamins & Minerals, 6(2), 167. Retrieved from 

https://mitohacker.pl/wp-content/uploads/2020/03/Vitamins-C-D-and-Zinc-Synergistic-Roles-in-Immune-Function.pdf

Aranow, C. (2011). Vitamin D and the immune system. Journal of Investigative Medicine, 59(6), 881–886. Retrieved from 

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3166406/?utm_source=newmarkettoday.ca&utm_campaign=newmarkettoday.ca&utm_medium=referral

National Institutes of Health. (2023, September 18). Vitamin D - Health professional fact sheet. NIH Office of Dietary Supplements. Retrieved from 

Shojadoost, B., Yitbarek, A., Alizadeh, M., Kulkarni, R. R., Astill, J., Boodhoo, N., & Sharif, S. (2021). Centennial Review: Effects of vitamins A, D, E, and C on the chicken immune system. Poultry Science, 100(4), 100930. Retrieved from 

https://www.sciencedirect.com/science/article/pii/S0032579120309810

Harvard T.H. Chan School of Public Health. (2023, March). Vitamin E. The Nutrition Source. Retrieved from 

https://nutritionsource.hsph.harvard.edu/vitamin-e/

National Institutes of Health, Office of Dietary Supplements. (2021, March 22). Vitamin E - Fact sheet for consumers. U.S. Department of Health & Human Services. Retrieved from 

https://ods.od.nih.gov/factsheets/VitaminE-Consumer/

Stach, K., Stach, W., & Augoff, K. (2021). Vitamin B6 in health and disease. Nutrients, 13(9), 3229. Retrieved from 

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8467949/

Office of Dietary Supplements. (2023, June 16). Vitamin B6 - health professional fact sheet. U.S. Department of Health and Human Services, National Institutes of Health. Retrieved from 

https://ods.od.nih.gov/factsheets/VitaminB6-HealthProfessional/

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MacLennan, A. H., Wilson, D. H., & Taylor, A. W. (1998). Hormone replacement therapy: Prevalence, compliance and the 'healthy women' notion. Climacteric, 1(1), 42-49. 

https://doi.org/10.3109/13697139809080680

Khapre, S., Deshmukh, U., & Jain, S. (2022). The impact of soy isoflavone supplementation on the menopausal symptoms in perimenopausal and postmenopausal women. Journal of Midlife Health, 13(2), 175–184. 

Taku, K., Melby, M. K., Kronenberg, F., Kurzer, M. S., & Messina, M. (2012). Extracted or synthesized soybean isoflavones reduce menopausal hot flash frequency and severity: Systematic review and meta-analysis of randomized controlled trials. Menopause: The Journal of The North American Menopause Society, 19(7), 776-790. 

https://doi.org/10.1097/gme.0b013e3182410159

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World Health Organization. (2022, October 17). Menopause. WHO. Retrieved from 

https://www.who.int/news-room/fact-sheets/detail/menopause

Abdi, F., Alimoradi, Z., Haqi, P., & Mahdizad, F. (2016). Effects of phytoestrogens on bone mineral density during the menopause transition: A systematic review of randomized, controlled trials. Climacteric, 19(6), 535-545. 

https://doi.org/10.1080/13697137.2016.1238451

Ghazanfarpour, M., Sadeghi, R., Latifnejad Roudsari, R., Khorsand, I., Khadivzadeh, T., & Muoio, B. (2016). Red clover for treatment of hot flashes and menopausal symptoms: A systematic review and meta-analysis. Journal of Obstetrics and Gynaecology, 36(3), 301-311. 

https://doi.org/10.3109/01443615.2015.1049249

Kanadys, W., Barańska, A., Błaszczuk, A., Polz-Dacewicz, M., Drop, B., Kanecki, K., & Malm, M. (2021). Evaluation of clinical meaningfulness of red clover (Trifolium pratense L.) extract to relieve hot flushes and menopausal symptoms in peri- and post-menopausal women: A systematic review and meta-analysis of randomized controlled trials. Nutrients, 13(4), 1258. 

Ehsanpour, S., Salehi, K., Zolfaghari, B., & Bakhtiari, S. (2012). The effects of red clover on quality of life in post-menopausal women. Iranian Journal of Nursing and Midwifery Research, 17(1), 34–40. 

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3590693/

Chen, L., Choi, J., Leonard, S. W., Banuvar, S., Barengolts, E., Viana, M., Chen, S.-N., Pauli, G. F., Bolton, J. L., & van Breemen, R. B. (2020). No clinically relevant pharmacokinetic interactions of a red clover dietary supplement with cytochrome P450 enzymes in women. Journal of Agricultural and Food Chemistry, 68(47), 12615-12624. 

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