• Vitamin B₁₈:
• Vitamin B₁₉:
• Vitamin B₂₀: carnitine
• Vitamin B₂₁:
• Vitamin B₂₂: often claimed as an ingredient of Aloe vera extracts but also in many other foods. Claimed by one source to be vitamin B₁₂b-δ.^{[citation needed]}

Note: B₁₆, B₁₇, B₁₈, B₁₉, B₂₀, B₂₁ & B₂₂ do not appear to be animal factors but are claimed by some naturopaths as human therapeutic factors.