Later determined to be
pteroylmonoglutamic acid mixed with other B vitamins. Its deficiency caused slowed growth and
deteriorated feather development in chicks, along with blood problems. It was believed
by some researchers to apply to humans. Some early researchers used the term
"vitamin B10" to denote para-aminobenzoic acid.
B10 is also known as factor R, Vitamin R, and Vitamin Bx. It was first found to be a factor causing the growth of feathers in chicks. Today, it is considered to have Vitamin Bc compounds possibly mixed with pteroylmonoglutamic acid and Vitamin B12.
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