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The nutrient facts for one ounce of cooked beef liver are as follows: Protein: 7.4 grams Total Fat: 1 gram Vitamin A: 1,573 IU Vitamin B12: 4.3 mcg Vitamin B2 (Riboflavin): 0.9 mg Folate (Vitamin B9): 67 mcg Vitamin D: 5.3 IU Copper: 2.4 mg Zinc: 1.1 mg Selenium: 6 mcg As you can see, beef liver is practically natures multivitamin

For subcutaneous and intramuscular peptide injection, both contraindications are non-issues the SubQ/IM route is what the product is designed for

Supplementation is often used for preventative reasons

1 2 Analytical and Bioanalytical Chemistry

Postmortem studies in mood disorders indicate altered numbers of neurons and glial cells

Another unresolved question relates to context and counterfactual outcomes