Natural Levels of Vitamin D
Sunlight = Vitamin D: Humans make 90 percent of their vitamin D naturally through sun exposure to the skin (without sunscreen). In Canada‚ our northern climate means UVB levels in sunlight are too weak 4-6 months of the year to makeany vitamin D naturally.
What is the intended, natural level of vitamin D that the human body was designed to operate with?
Humans evolved in the horn of Africa, close to the Equator over 30,000 years ago. They spent their days out in the full sun, with no clothing, hunting and gathering food. Their skin pigment evolved and protected them from sun burns and allowed the production of vitamin D through the skin. Nature never intended for humans to live and work indoors, in cubicles, without sunshine exposure.
Non-Human Primates: 125 – 200 nmol/L
Vieth 2004 – Why the optimal requirement for Vitamin D3 is probably much higher than what is officially recommended for adults
Maasai and Hadzabe, Tanzania: 115 nmol/L
Luxwolda 2012 – Traditionally living populations in East Africa have a mean serum 25-hydroxyvitamin D concentration of 115 nmol/L
Outdoor Workers – Lifeguards: 163 nmol/L
Haddad 1971 – Competitive protein-binding radioassay for 25-hydroxycholecalciferol
Outdoor Workers – Puerto Rico Farmers:135 nmol/L
Haddock 1982 – 25(OH)D serum levels in normal Puerto Rican population and its subjects with tropical sprue and parathyroid disease
Outdoor Workers – Nebraska: 122 nmol/L
Barger-Lux, Heaney 2002 – Effects of above average summer sun exposure on serum 25-hydroxyvitamin D and calcium absorption
Indoor Tanners: 95 nmol/L
Schwalfenberg 2010 – Addressing vitamin D deficiency in Canada: A public health innovation whose time has come
Average Canadian: 68 nmol/L
Statistics Canada – Langlois 2010 – Vitamin D status of Canadians as measured in the 2007 to 2009 Canadian Health Measures Survey
Dermatologists: 35 nmol/L
Czarnecki 2009 – The vitamin D status of Australian Dermatologists
GrassrootsHealth and over 40 Vitamin D Scientists recommend achieving an optimal Vitamin D level for disease prevention of 100-150 nmol/L using a 25(OH)D blood test. This is the natural levels that the human body had as it evolved over thousands of years. Everyone should have their vitamin D 25(OH)D blood serum levels tested and make sure they are within these guidelines.
Michael F. Holick, Ph.D., M.D.
A summary of the health benefits and disease incidence prevention
that could be achieved by raising the public's vitamin D levels to 125 nmol/L:
• Rickets, reduced by 100%
•Osteomalacia, reduced by 100%
• Cancers, all combined, reduced by 75%
• Breast Cancer, reduced by 50%
• Ovarian Cancer, reduced by 25%
• Colon Cancer, reduced by 67%
• Non-Hodgkins, reduced by 30%
• Kidney Cancer, reduced by 67%
• Endometrial Cancer, reduced by 35%
• Type 1 Diabetes, reduced by 80%
• Type 2 Diabetes, reduced by 50%
• Fractures, all combined, reduced by 50%
• Falls, women reduced by 72%
• Multiple Sclerosis, reduced by 50%
• Heart Attack, men, reduced by 50%
• Peripheral Vascular Disease, reduced by 80%
• preeclampsia reduced by 50%
• Cesarean Section, reduced by 75%