Acetylcholine

Acetylcholine is the neurotransmitter used by the brain for cognition and short-term memory. Boosting acetylcholine levels is an effective (and FDA-approved) method of treating dementia/Alzheimer’s. We must have optimal levels of acetylcholine to maximize our brain health.

Some of us need antihistamines and may need them chronically. Those of us with allergies, asthma, high IgE levels, mast cell activation syndrome (MCAS), and other chronic inflammatory conditions can improve our symptoms with antihistamines. Some of us cannot achieve the same response through dietary changes.

Even more importantly, histamine has been shown to actually cause Alzheimer’s-like effects on the brain — so it must be controlled!

Is it possible to take antihistamines to block histamine, yet still boost our levels of acetylcholine? After all, antihistamines are taken to block histamine — the anticholinergic effects are a side- effect only (not the mechanism of action of the drug).

As a Patient

As a patient, antihistamines can be hugely helpful for me, but I didn’t want them to affect my brain. For years, I suffered from extreme mental decline due to low acetylcholine levels. Neurological tests showed my short-term memory was almost non-existent. I suffered from such mental fatigue that I have difficulty making a “to-do” list of even 3 items. If I accomplished that feat, then I was too exhausted to do any of the items on the list, and instead, I went back to bed for most of the day.

My case was a dramatic one – at one point I was only able to stay awake for about three hours a day and during those 3 hours, I wanted to be asleep. Even more frightening I felt that I was getting worse every day. Although my problems were not all due to low acetylcholine from antihistamines, I didn’t want the medication to worsen it! Boosting my acetylcholine was the essential missing piece in restoring my cognition and levels of mental energy. This allowed me to stay on necessary antihistamines, yet restore and retain my cognition.

Having lost my mental function for so long, I have no intention of losing it again. I fight both histamine and inflammation by supporting my acetylcholine levels. This is an essential part of my morning — every morning.


Support Your Vagus Nerve

Support Your Vagus Nerve

Parasym Plus is the only patented supplement designed to support vagus nerve function, acetylcholine levels, and the parasympathetic nervous system.

Shop Parasym Plus
A blonde woman wearing a white blazer over a blue turtle neck smiling.
About the Author

Diana Driscoll, OD

Dr. Diana Driscoll is a foremost authority on autonomic dysfunction, Postural Orthostatic Tachycardia Syndrome (POTS), Chronic Fatigue Syndrome (ME/CFS), chronic dry eye, vagus nerve disorders, Ehlers-Danlos syndrome (EDS), and similar “invisible” illnesses. She is the Founder and President of Genetic Disease Investigators and the Clinical Director of POTS Care, the only clinic in the world dedicated to treating the underlying medical causes of POTS, not just the symptoms. An inventor with three patents to date, she is also the Founder and President of TJ Nutrition — a company based on her expertise concerning the autonomic nervous system.

Related Articles

Jan 30, 2025

Why You Don’t Need to Stimulate Your Vagus Nerve

The recent surge in interest around the vagus nerve has led many to seek methods to stimulate their vagus nerve – everything from humming or splashing water on their face to using expensive vagus nerve stimulators. However, it's essential to realize that the vagus..

Oct 22, 2025

Top Symptoms Of Low Acetylcholine

Acetylcholine is one of the body's most important neurotransmitters. You can't see it, you can't measure it, but it is critical for your health. Acetylcholine is a neurotransmitter — a chemical messenger that allows your nerves to communicate.

Jan 30, 2025

Exciting New Science Released — Dry Eyes in Ehlers-Danlos Syndrome

Patients suffering from Ehlers-Danlos syndrome (EDS) often experience a myriad of ocular symptoms. These conditions are addressed in my latest book, “Ehlers-Danlos Syndrome: Your Eyes and EDS Updated” and which conditions can be detrimental or which are merely...

Oct 22, 2025

Before Taking N-Acetylcysteine Read This!

N-Acetylcysteine (NAC) helps your body produce glutathione, the master antioxidant that supports immune function and reduces cellular damage. But taking NAC alone isn't the full picture. To maximize its benefits, your body also needs specific nutrients like vitamin C, alpha-lipoic acid, and selenium to recycle and activate glutathione properly.