Emerging preclinical evidence points toward possible roles in neural recovery following traumatic brain injury, stroke, and peripheral nerve injury

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The practical takeaway: Injection = high systemic distribution tendons, ligaments, muscle, joints, vascular tissue Oral = high local GI concentration intestinal lining, gastric mucosa, gut repair Nasal = intermediate systemic delivery potential neurological targeting, emerging evidence only Injectable BPC-157: Highest Bioavailability for Systemic and Musculoskeletal Goals Injectable BPC-157 is the best-studied delivery method for healing applications outside the gastrointestinal tract
It is then perfectly fine to give Vitamin B12 along with a meal of one's choice that has minimal fats since fat slows the absorption of water-soluble vitamins
It depends on the cause of deficiency