Welcome to lesson 3

References:

https://www.sciencedirect.com/science/article/abs/pii/S0277953619300048?via%3Dihub

https://ajph.aphapublications.org/doi/full/10.2105/AJPH.2016.303260

https://www.sciencedirect.com/science/article/pii/S0277953618306907?via%3Dihub

https://www.mdpi.com/2072-6643/10/12/1833

https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0171206

https://www.frontiersin.org/articles/10.3389/fnut.2014.00010/full

https://pubmed.ncbi.nlm.nih.gov/22362552/

https://pubmed.ncbi.nlm.nih.gov/14748939/

https://pubmed.ncbi.nlm.nih.gov/17031063/

https://pubmed.ncbi.nlm.nih.gov/23365108/

https://pubmed.ncbi.nlm.nih.gov/23497350/

https://pubmed.ncbi.nlm.nih.gov/22935321/

https://pubmed.ncbi.nlm.nih.gov/22354959/

https://pubmed.ncbi.nlm.nih.gov/5573330/

https://pubmed.ncbi.nlm.nih.gov/25053030/

https://pubmed.ncbi.nlm.nih.gov/53752/

https://pubmed.ncbi.nlm.nih.gov/9407559/

https://pubmed.ncbi.nlm.nih.gov/14077487/

https://pubmed.ncbi.nlm.nih.gov/26769089/

https://pubmed.ncbi.nlm.nih.gov/27235832/

https://pubmed.ncbi.nlm.nih.gov/10205210/

https://pubmed.ncbi.nlm.nih.gov/25739376/

https://pubmed.ncbi.nlm.nih.gov/26857640/

https://pubmed.ncbi.nlm.nih.gov/1941656/

https://pubmed.ncbi.nlm.nih.gov/3165514/

https://pubmed.ncbi.nlm.nih.gov/1941656/

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3576783/

https://nap.nationalacademies.org/read/6015/chapter/7

https://blog.biotrust.com/14-vitamin-deficiency-signs/

https://www.healthline.com/nutrition/vitamin-deficiency#1.-Brittle-hair-and-nails

https://bestlifeonline.com/signs-of-vitamin-deficiency/