It's the wrong molecule
SLU-PP-332 SLU-PP-332 is a synthetic small-molecule ERR (estrogen-related receptor) pan-agonist under investigation for its role in mitochondrial biogenesis, skeletal muscle fiber-type switching, and metabolic regulation
What the Authoritative Sources Say About B12 Deficiency and Supplementation The National Institutes of Health Office of Dietary Supplements publishes the most thorough citation-backed overview of vitamin B12 its role in red blood cell formation and neurological function, the populations most at risk for deficiency (older adults, people on long-term metformin or proton pump inhibitors, vegetarians and vegans, people who have had gastric bypass surgery), and the recommended daily intake at each life stage
The safety profile is comparable across injection, oral, and sublingual forms
1 mg is the same as 1000 mcg
You can get more vitamin B12 from chicken, eggs, and fish