When to take it
In the morning or during the day with food.
← All supplements
VitaminsModerate evidence
Vitamin B1
Also known as: thiamine
Vitamin B1 is needed to turn carbohydrates into energy and for normal nerve and heart function. Deficiency is mainly a risk with heavy alcohol use, long-term diuretic use, after bariatric surgery and with very restricted diets.
What it is used for
- Normal energy metabolism and nervous system function – strong evidence (EFSA)
- Treatment of deficiency (e.g. with heavy drinking) – strong evidence, under medical care
- More energy without deficiency – weak evidence
Forms and how they differ
thiamine hydrochloride or mononitrate
standard forms
benfotiamine
fat-soluble derivative with better absorption; studied in diabetic neuropathy
Pairs well with
Other B vitamins, magnesium.
Do not combine / separate
Coffee, black tea and alcohol may reduce absorption – keep a gap.
Watch out for
If you take medicines (e.g. diuretics) or are pregnant, consult your doctor.
Safety
EFSA has not set an upper limit – excess is excreted in urine. Do not exceed the label dose.
Practical tip
Whole grains, legumes, pork and sunflower seeds are good natural sources of B1.
Products containing Vitamin B1 5
Vitamin B1 160 mgbenfotiamine · 160 mg / capsule
Vitamin B1 + Alpha-lipoic acid 300 mgbenfotiamine · 300 mg / capsule
Vitamin B1 100 mg100 mg / serving
Vitamin B1 100 mgthiamine HCl · 100 mg / capsule
Vitamin B1 thiamine chloride 50 mgthiamine chloride · 50 mg / tablet
How to read the evidence rating
Strong evidenceModerate evidenceWeak evidenceNo evidence
Strong = several good human studies or official recommendations; moderate = promising but smaller studies; weak = few studies or mixed results; no evidence = claims not confirmed.
Combination check
Select the supplements you take and, if relevant, your medicines. We show what interferes, what needs a time gap and what to watch out for.
Check Vitamin B1 with othersWhich supplements do you actually need?
Fénix Methode picks them from your blood results and schedules when to take what – no needless purchases.
From the same group
B complexModerate evidenceBeta-caroteneWeak evidenceBiotinWeak evidenceBrewer's yeastWeak evidenceCamu camuWeak evidenceCholineModerate evidence
Important notice
This information is educational and does not replace advice from a doctor or pharmacist. We do not give medicine dosages. Supplements are no substitute for a varied diet; if pregnant, breastfeeding, ill or on medication, consult a doctor first.