Health Claims

Taking betaine supplements doesn’t change your ‘good’ cholesterol or fat levels in the blood, but it might lower your ‘bad’ cholesterol without messing up anything else in your lipid system.

Descriptive

If you have a specific gene variant that makes it hard for your body to process folic acid and your homocysteine levels are high, adding betaine (a natural compound) might help lower those levels better than folic acid alone.

Mechanistic

When your body doesn’t have enough folate (a B vitamin), betaine can step in to help lower a harmful substance called homocysteine—kind of like a backup helper when your main one is running low.

Mechanistic

Taking betaine supplements (4–6 grams a day) for a few months might slightly raise your 'bad' cholesterol by about 5 points, which could cancel out some of the heart benefits you get from lowering another blood chemical called homocysteine.

Correlational

Taking 4 to 6 grams of betaine every day for a few weeks to months can slightly lower a substance in your blood called homocysteine, which might help your body process nutrients better—kind of like giving your metabolism a little tune-up.

Mechanistic

Taking a daily multivitamin might help older adults remember things better and think more clearly, based on a summary of three big studies—but we haven’t seen the full details yet.

Correlational

Taking a daily multivitamin might slightly help your memory and thinking as you age, but the evidence isn’t strong enough to say for sure—it’s like a tiny nudge in the right direction that could just be luck.

Correlational

Taking a daily multivitamin for two years might help older adults remember things like names or where they put their keys just a little better than not taking one — it’s a tiny boost, but it’s real.

Causal

Taking betaine supplements doesn't change the level of choline in your blood, which means your body doesn't use betaine to make or use choline right away.

Mechanistic

Taking betaine supplements doesn't change the levels of amino acids in the blood of healthy, active guys, which means it doesn't really mess with how their bodies use or balance proteins.

Descriptive

People with a certain gene variant (MTHFR C677T T-allele) see a bigger boost in a substance called betaine in their blood when they take betaine supplements, compared to people without that gene variant.

Mechanistic

Taking betaine, a natural compound found in foods like beets and spinach, can slightly lower a substance in your blood called homocysteine—which, when too high, might be bad for your heart. This suggests betaine helps your body process certain nutrients better.

Quantitative

Taking betaine supplements can boost the amount of betaine in your blood by more than three times, which means your body easily absorbs and uses it.

Quantitative

Taking up to 4 grams of betaine a day might help lower a harmful blood chemical called homocysteine without making your cholesterol or fats go up—but taking more than that could raise your cholesterol and fats.

Causal

Taking betaine supplements doesn't seem to make a noticeable difference in your blood fats, sugar, inflammation, liver health, or blood pressure — at least not in most adults.

Correlational

Taking betaine supplements may raise levels of betaine and some related compounds in your blood, slightly increase your 'bad' cholesterol, and lower a harmful substance called homocysteine — but it’s not clear if this is good or bad for your health.

Correlational

Taking a daily multivitamin might make your brain act as if it’s two years younger, based on a big study of older adults.

Quantitative

Taking a daily multivitamin for two years helped older adults remember things like names or where they put their keys a little better than those who took a sugar pill.

Causal

Taking a daily multivitamin for two years helped older adults (60+) remember things a little better and think more clearly—though the improvement was small.

Quantitative

Older adults who were having mild memory or thinking problems got noticeably better at memory tests after wearing hearing aids for three months.

Causal

Even if an older person has worse memory or thinking skills, it doesn’t change how much better they feel or how much easier it is to listen after getting hearing aids — the hearing aids help just as much no matter their brain health.

Correlational

If older adults with moderate hearing loss wear hearing aids for three months, they often feel like their daily life gets better and listening to people becomes less tiring.

Correlational

Giving betaine to rats helps their livers get rid of excess fat, and this works partly because it brings back two important chemicals—methionine and SAM—that help the liver function properly.

Mechanistic

Betaine, a natural compound, can stop a harmful substance (homocysteine) from blocking an important energy-sensing system in one type of liver cell, but not in another—because the first cell type has a special enzyme (BHMT) that the second one doesn’t have enough of.

Mechanistic