Frankly, completely false, and others have some merit and are starting to gain some data within the standard scientific community
When in doubt, consult a medical professional instead of experimenting on your health
B12 injections, on the other hand, allow up to 100% absorption and immediate use by the body
Vitamin B complex supplement for horses and dogs COMPOSITION Thiamine disulphide nitrate (Vitamin B1) 20 mg/mL Riboflavin (Vitamin B2) 5 mg/mL Pyridoxine hydrochloride (Vitamin B6) 20 mg/mL Nicotinamide (Vitamin B3) 60 mg/mL Pantothenate (Vitamin B5) 20 mg/mL Hydroxocobalamin (Vitamin B12) 200 g/mL ACTIONS VITAMIN B COMPLEX INJECTION provides the water soluble vitamins which are essential to carbohydrate and fat metabolism, as well as for protein synthesis
This is because their bodies change with age
At best, it is hypothesis-generating , and at worst, the findings may simply reflect placebo effects or biased reporting