Biotin

Japanese: biotin

...(3) Overdose Pantothenic acid does not cause side effects when administered in large amounts, and there have been few reports of overdose.
[Biotin]
It is a member of the vitamin B complex, widely distributed in natural foods, and was also called vitamin H and coenzyme R. It was isolated from egg yolk as a factor necessary for yeast growth.

From [Coenzyme]

...The SH group in the molecule is the center of physiological activity. (5) Biotin Also known as vitamin H. It is known as a coenzyme in the carbon fixation reaction and is important in the metabolism of lipids and carbohydrates.

*Some of the terminology that mentions "biotin" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…(3)過剰症　パントテン酸は，大量投与により副作用は認められず，また過剰症についてもほとんど報告されていない。
［ビオチンbiotin］
　ビタミンB複合体の一つであり，天然の食品に広く分布し，ビタミンH，補酵素Rとも呼ばれた。酵母の増殖に必要な因子として卵黄から単離された。…