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Many of David Wolfe's proposed B12 sources have been directly tested and shown to be inadequate. Nori and spirulina failed to correct deficiency in macrobiotic children and did not maintain adequate blood B12 levels in a Finnish raw food community. Probiotics did not consistently correct low B12 availability in Hallelujah dieters. A UK raw food vegan went B12 deficient while growing his own food and eating it unwashed: based on measured B12 levels in soil this is unsurprising. Other proposed sources have not been tested so directly, but the only two published studies of B12 levels in raw food vegans both showed inadequate B12 levels. Low B12 levels give rise to elevated homocysteine levels with an associated increased risk of many illnesses, including stroke and heart disease, without any classical B12 deficiency symptoms. In children the onset of full-blown deficiency can be very rapid with much greater risk of long-term damage or even death. At least 3 micrograms per day of B12 from fortified foods or supplements is needed to minimise homocysteine levels in adults. Breast milk is an adequate source for infants only if the mother's intake is adequate.
The main argument for the desirability of high raw diets derives from comparison with our evolutionary diet and the diets of our great ape relatives. All the great apes eat diets centred on raw fruit (chimps, bonobos, orangutans, lowland gorillas) or raw leaves (highland gorillas) and including a mixture of fruit (including large amounts of seeds), leaves, shoots, insects and often nuts. Use of cooked foods and large amounts of grains is unique to humans. It is further suggested that a return to a diet more like that of our ape relatives would bring great benefits to health as it is the diet to which we are evolutionarily adapted. This is a plausible argument and the nutrient content of such a diet matches modern nutritional knowledge in many ways: e.g. high folate, vitamin C, vitamin K, potassium and magnesium intakes along with low saturated fat and cholesterol. However, there are important limitations to using the plant content of great ape diets as a model for ideal human diets.
http://www.superfoodhealthyliving.com/article-Marine-Phytoplankton.html
http://www.superfoodhealthyliving.com/raw-foods-blog/income-opportunity.html
