If I suspect an autoimmune cause for vitamin B12 deficiency (as covered earlier when discussing pernicious anaemia), I can request anti-intrinsic factor antibodies
stable at room temperature for short-term handling All material is synthesized using state-of-the-art solid-phase peptide synthesis (SPPS) under ISO-certified laboratory conditions at Pepsynth Labs
Over time, the constant excretion of cortisol begins to fatigue the adrenal glands, and because the adrenals produce reserve stores of sex hormones, such as estrogen, progesterone, and testosterone, it may cause the body to steal the materials needed to make these sex hormones and convert them into more cortisol
Kong J, Wan L, Wang Y, Zhang H, Zhang W
Vitiello.Journal of Anti-Aging Medicine.Dec 2001.331-343