Answers to the questions you were already asking

Protein supplements are expensive because the raw ingredient is only one part of the price. Processing, flavor systems, packaging, retailer margins, third-party testing, influencer marketing, and demand for high-protein foods all add cost, while regulation leaves much of the quality signal to private certification rather than FDA pre-approval.

B12 starts changing blood markers within days to weeks if you are deficient, but noticeable benefits vary: anemia often improves within weeks, while nerve or cognitive symptoms can take months and may not fully reverse if deficiency was prolonged.

For most people lifting weights, aim for about **1.6 grams of protein per kilogram of body weight per day** (0.7 g/lb/day). Going up to roughly **2.2 g/kg/day** can be reasonable, but trials do not show a clear muscle-building advantage beyond that for most lifters.

For most healthy kids in the United States, the supplement with the strongest routine case is vitamin D, especially in breastfed infants and children who do not get enough fortified foods. Iron and vitamin B12 matter for specific children, but a daily multivitamin is usually not the evidence-based default.

Many adults over 50 should get B12 from fortified foods or a supplement, not because everyone is deficient, but because food-bound B12 absorption declines with low stomach acid. For most, oral cyanocobalamin is the practical first choice; injections are mainly for confirmed deficiency with severe symptoms or poor response to oral therapy.

If you are a woman over 50, look for an iron-free multivitamin with vitamin B12, moderate vitamin D, no megadoses, and a credible third-party quality mark. The goal is nutritional backup, not bone-fracture prevention or hormone support in a bottle.

For muscle gain, aim for about 1.6 grams of protein per kilogram of body weight per day. For fat loss while lifting, 1.6 to 2.4 g/kg is a better target, and for healthy aging most adults over 65 should land near 1.0 to 1.2 g/kg, higher if active or recovering from illness.

Vitamin supplements work when they correct a deficiency or meet a specific life-stage need, but they do not reliably make already well-nourished adults healthier. For preventing cardiovascular disease or cancer, the USPSTF finds evidence insufficient for most vitamins and recommends against beta carotene and vitamin E.

Most men over 50 should not take a multivitamin by default. If one makes sense, choose a basic age-adjusted multivitamin-mineral without iron, without megadoses, and with roughly daily-value levels of vitamin D, B12, zinc, and other essentials, not a high-potency “men’s vitality” product.

Look for a prenatal with a current USP Verified, NSF, or ConsumerLab quality listing, then confirm the product and exact form in the certifier’s database or on the product page. A brand claim alone is not enough, because FDA does not pre-approve prenatal supplements for safety or effectiveness before sale.

The biohacking supplement trend gets the self-monitoring instinct right: dose, baseline status, sleep, exercise, and labs matter. It gets longevity certainty wrong, especially when early biomarker changes are sold as proof of longer or healthier life.

Take creatine whenever you will take it consistently. Timing around workouts appears less important than reaching and maintaining saturated muscle creatine stores, although taking it near training is a reasonable habit if it improves adherence.