Is curcumin well absorbed by your body?
Ordinary curcumin without any addition is barely absorbed by the body; choose a product with piperine (black pepper extract) or a specialised formulation to notice any effect.
Standard curcumin powder, taken without anything added, is barely absorbed by the body. After a dose of 2 grams, blood levels in humans were undetectable or negligibly low. There are three reasons for this: the intestine absorbs curcumin poorly, the liver and intestinal wall break it down rapidly, and it is then also excreted quickly.
The best-known solution is combining curcumin with piperine, a compound found in black pepper. Research in humans showed that 20 mg of piperine taken together with 2 grams of curcumin increased absorption by 2000% compared with curcumin alone. Piperine achieves this by inhibiting the rapid breakdown in the liver and intestinal wall. No side effects were reported in that study.
Advanced formulations also exist, such as curcumin in lipid vesicles, nanoparticles, or phospholipid complexes. These can improve solubility and the time curcumin remains in the bloodstream. How large the difference is depends on the specific formulation, and comparative research is still ongoing.
Notably, more than 200 clinical studies have been conducted that nevertheless report positive effects in conditions ranging from inflammatory disorders to cardiovascular disease, despite those low blood levels. How this is possible is not certain. It may be that higher doses or better formulations still deliver sufficient active compound. Another explanation is that breakdown products of curcumin are themselves biologically active. This debate has not yet been settled.
Regarding safety: human safety studies show that even doses of up to 12 grams per day produced no serious side effects. How large the absorption problem is in practice is debated: clinical studies also show effects with ordinary curcumin.
This answer draws on multiple human studies and broader reviews of the available literature. The finding on poor absorption and the 2000% increase with piperine comes from direct human research and is confirmed by multiple sources. The data on advanced formulations are still developing and effectiveness varies by product. The findings on positive clinical effects despite low blood levels are mixed and not yet fully explained; the researchers themselves emphasise that this calls for caution when drawing conclusions.
How much curcumin should you take per day?
There is no fixed 'correct dose' of curcumin: for joint pain, less than 1000 mg per day works just as well as more, but for other uses this varies. Always combine curcumin with piperine or another formulation with better absorption, otherwise barely anything is demonstrably present in your blood.
Is rapamycin found in food, or can you get it naturally through your diet?
Rapamycin is not present in food and cannot be obtained naturally through eating. If you want to learn more about it in the context of health or ageing, discuss it with your doctor.
Does echinacea really work against the common cold?
Whether echinacea helps with the common cold depends strongly on which preparation you use. Standardised products made from Echinacea purpurea (herb and root) showed a modest reduction in symptoms in some studies, but root extracts and non-standardised products did not improve outcomes, and what you buy in a shop rarely corresponds to the products used in positive studies.
Can anyone take rapamycin?
Rapamycin is a powerful drug with serious side effects, including reduced immune function and blood sugar disturbances, and is not suitable for independent use outside medical supervision.
Does taking glutathione make sense, or is it broken down in your gut?
Oral glutathione measurably raises levels in blood and cells, so it is not entirely pointless. Whether that rise translates into tangible health benefits has not yet been properly studied.
Can you take too much magnesium?
Yes, too much magnesium can be dangerous, although serious toxicity through ordinary supplements is rare in people with healthy kidneys. With kidney problems or the use of intravenous magnesium, medical supervision is genuinely necessary.