It probably won't matter, however. Biology adapts.
- Vitamins B1, B2, B3, B5, B6 and B12
- 89% of the RDA for selenium
- 53% of the RDA for phosphorus
But let's be honest, you don't eat bacon for the vitamins.
To start it uses 3.5 oz (100g) as its serving size, which is (according to its own nutritional source) about 13 slices of bacon... Not exactly a "typical" serving.
On a per slice basis...
Looking at its own source (https://nutritiondata.self.com/facts/pork-products/7676/2):
B1 (Thiamin) - 0.0 mg (2%) B2 (Riboflavin) - 0.0 mg (1%) B3 (Niacin) - 0.9 mg (4%) B5 (Pantothenic Acid) - 0.1 mg (1%) B6 - 0.0 mg (1%) B12 - 0.1 mcg (2%)
Selenium - 5 mcg (7%) Phosphorus - 42.6 mg (4%)
So, yes, technically it does contain those vitamins... But, like I said, not exactly in large amounts...
Also, you have to consider that bacon can lose up to something like 75% of its weight during cooking...