Written by the Plenthera team (orthomolecularly trained). Scientifically reviewed in April 2026. Last updated: 18 September 2026.
Betaine HCl is not an enzyme but a hydrochloric acid supplement — for those who produce too little stomach acid. With age (the body's own stomach acid production declines) or after long-term use of acid inhibitors, protein digestion, for which stomach acid is essential, can falter. At Plenthera you will find betaine HCl combined with pepsin (the stomach acid-dependent protein enzyme) and gentian bitters, as well as TMG betaine — the same molecule without hydrochloric acid, with its own application. WARNING: do NOT use betaine HCl in case of a stomach ulcer, gastritis or reflux complaints.
Which betaine suits you?
| Form | Best for |
|---|---|
| Betaine HCl + pepsin + gentian bitters | Stomach acid theme with protein-rich meals |
| TMG betaine 1000 mg | Methyl donor — homocysteine metabolism (different application) |
| Stand-alone betaine HCl (elsewhere on the market) | Those who want to dose without pepsin |
What is betaine?
Betaine HCl (betaine hydrochloride) is a hydrochloric acid supplement that temporarily lowers the pH in the stomach. Not an enzyme, but relevant to stomach acid-dependent digestion. Often combined with pepsin.
The level of stomach acid is an underestimated aspect of digestion. Sufficient stomach acid is needed for protein breakdown (it activates pepsin), for the absorption of minerals (calcium, iron, magnesium) and vitamin B12, and as a natural barrier against foodborne pathogens. The body's own stomach acid production declines with age — from around the age of 60, a considerable part of the population produces less stomach acid (hypochlorhydria).
Betaine HCl supplementation is a direct hydrochloric acid supplement. Taken with a meal (especially a protein-rich one), it temporarily lowers the pH in the stomach — comparable to natural stomach acid. The usual protocol is to start with one capsule and build up until slight warmth in the stomach is felt; then go back one step.
CRUCIAL CAUTION: betaine HCl is CONTRAINDICATED in case of a stomach ulcer, gastritis, GERD/reflux complaints and when using NSAIDs or corticosteroids. If in doubt: consult a doctor or pharmacist beforehand.
What does the science say about betaine?
Clinical research into betaine HCl is limited. A small study (Yago et al., 2013) showed that in subjects with pharmacologically raised stomach pH, betaine HCl temporarily lowers the pH again — so the mechanism can be demonstrated, but there are no large clinical trials in hypochlorhydria. In orthomolecular practice it is used functionally under supervision.
For TMG betaine, the situation is different: the EU has authorised one health claim — 'Betaine contributes to normal homocysteine metabolism.' This claim applies at a daily intake of 1.5 g of betaine; an intake of more than 4 g per day may significantly increase blood cholesterol levels.
The betaine forms at Plenthera
Betaine HCl + pepsin + gentian bitters — Doctor's Best (120 and 360 capsules)
Betaine hydrochloride combined with pepsin (which needs stomach acid to become active) and gentian root, a classic bitter. One capsule per protein-rich meal as a starting point, to be built up according to the label.
TMG betaine 1000 mg — Now Foods (100 tablets)
Trimethylglycine without hydrochloric acid. A methyl donor with an authorised EU claim for homocysteine metabolism at 1.5 g per day. Not intended for the stomach acid theme.
Other forms on the market
Stand-alone betaine HCl capsules (usually 600-650 mg) without pepsin. Not currently in our range.
How do you use betaine?
A simple basic approach to betaine HCl:
- Start with 1 capsule with a protein-rich meal.
- Build up gradually until you feel slight warmth in the stomach.
- Then go back to just below the warmth threshold — that is your dose.
- In case of a stomach ulcer, gastritis or reflux: do NOT use — it may make things worse.
- With NSAIDs or corticosteroids: consult a doctor beforehand.
- Particularly relevant with protein-rich meals (meat, fish, pulses).
TMG betaine: 1-2 tablets per day with a meal, according to the label; stay below 4 g per day.
Myths and misconceptions about betaine
Myth 1: 'Everyone with digestive complaints has low stomach acid.'
Incorrect. High stomach acid (reflux) and low stomach acid can cause similar symptoms. If in doubt: get a medical diagnosis.
Myth 2: 'Betaine HCl treats reflux.'
Incorrect and risky — it may actually make reflux worse. Treating reflux requires a different approach.
Myth 3: 'A high dose works faster.'
Incorrect, and it may cause irritation. Build up gradually.
Combining betaine with other supplements
Betaine HCl is often combined. Popular combinations:
- Pepsin: the stomach acid-dependent protein enzyme. A classic combination — already included in our Doctor's Best formula.
- Digestive enzymes: for broad coverage of proteins, fats and carbohydrates.
- Live cultures: for the gut theme.
- Bone broth: wholefood for the stomach and gut.
- B vitamins (with TMG): vitamin B6, B12 and folate contribute to normal homocysteine metabolism.
Frequently asked questions
What is betaine HCl?
A hydrochloric acid supplement for the stomach acid theme. Not an enzyme.
Do I have low stomach acid?
Possible signs: a bloated feeling after protein, tiredness, mineral deficiencies. A medical test (Heidelberg test) confirms it.
How much betaine HCl per day?
Start with 1 capsule per protein-rich meal, building up until slight warmth is felt.
When should you take betaine HCl?
With a protein-rich meal.
Betaine HCl in older age?
Possibly relevant — the body's own stomach acid production declines with age.
Difference between betaine HCl and TMG?
Betaine HCl: stomach acid theme. TMG: methyl donor; betaine contributes to normal homocysteine metabolism (1.5 g/day).
Betaine HCl with a stomach ulcer?
Do NOT use — it may make things worse.
Does betaine have side effects?
Stomach complaints in case of overdosing or incorrect use. TMG above 4 g/day may raise cholesterol.
Betaine + pepsin?
A classic combination — pepsin requires stomach acid to be active.
Experiences with betaine HCl?
Variable — those who genuinely have little stomach acid notice something most often, others do not.
Sources
- Regulation (EU) 432/2012 — authorised claim 'Betaine contributes to normal homocysteine metabolism' (conditions: 1.5 g/day; warning above 4 g/day).
- Yago M.R. et al., "Gastric reacidification with betaine HCl in healthy volunteers with rabeprazole-induced hypochlorhydria", Mol Pharm (2013).
- Roxas M., "The role of enzyme supplementation in digestive disorders", Altern Med Rev (2008).
Disclaimer: This text is for information purposes only and does not replace medical advice. Betaine is a food supplement, not a medicine. If in doubt or if you take medication, we recommend consulting a doctor or orthomolecular therapist first.