Thank you very much mrsD for your prompt response. I have ordered Doctor's Best R-Lipoic Acid Stabilized, Source Naturals Methylcobalamin, Vitamin Shoppe Acetyl-L-Carnitine, and Source Naturals L-Theanine from Vitamin Shoppe. Some of the stores do not ship health supplements to Singapore eg Amazon.
Your willingness to help others with medical problems is exceptional and is to be applauded and I appreciate that very much. I will keep you updated on my progress once the supplements arrive. They informed me that they are on the way and I eagerly await their arrival. Best wishes to you.