Fireblood Blog — Supplement Science & Ingredient Guides

Dumbbells on a gym floor in low light
Best multivitamin for men over 50: what actually changes
After 50, B12 absorption, vitamin D synthesis and stomach acid all drop. The five things a multivitamin has to get right, and why. Read more...
Gloved hand tipping a scoop of amino acid powder into an open palm
BCAA vs EAA: why three amino acids fall short
BCAAs raise muscle protein synthesis 22% over placebo. EAAs supply all nine your body cannot make. What that difference means in practice. Read more...
Van Gogh still life of potatoes in an earthen bowl against a dark background
Foods high in potassium: 17 ranked, and the banana problem
A baked potato has 919mg of potassium. A banana has 362mg. Here are 17 foods ranked on USDA data, plus why no supplement fixes this. Read more...
Supplement capsules spilled on a dark surface
Magnesium threonate vs glycinate: which one you need
Magnesium glycinate wins for daily repletion and sleep. Threonate is a narrow brain bet on one small trial. Here is the honest comparison. Read more...
Supplement pills on a black surface
OptiMSM: what that branded MSM on your label actually is
OptiMSM is a distilled, branded form of MSM. Here is how it differs from cheap crystallized MSM, what the research shows, and why Fireblood uses 500mg. Read more...
Raw salmon fillet, a source of vitamin B6, sliced on a dark stone surface
Vitamin B6 deficiency symptoms and how to fix them
Vitamin B6 deficiency symptoms: nerve tingling, cracked lips, low mood, anaemia. What B6 does, who runs low, and the active form that works. Read more...
Close-up of sunflower seeds, one of the richest natural food sources of vitamin E
Best form of vitamin E: why mixed tocopherols win
The best form of vitamin E is natural mixed tocopherols, not synthetic alpha-tocopherol alone. Here is what your body keeps and what it dumps. Read more...
Coloured pills and capsules on a dark surface
Multivitamin side effects: the 6 real ones and what causes them
Most multivitamin side effects come from the dose, the form, or an empty stomach. Here are the 6 real ones, what causes them, and how to avoid them. Read more...
Raw beef on a dark surface, one of the foods highest in zinc
Foods high in zinc: best sources and the catch
Foods high in zinc, ranked by what your body actually absorbs, plus how men can hit 11mg a day without guessing. Read more...
Assorted vitamin and supplement pills spilled from a white bottle on a dark surface
How much B12 per day? What your body actually absorbs
How much B12 per day do you need? The RDA is 2.4mcg, but labels say 1000mcg. The absorption science, and when high doses actually matter. Read more...
Slices of orange, lemon and grapefruit, sources of vitamin C
Best form of vitamin C: 5 forms, ranked
Ascorbic acid wins for most people. Here is when buffered or liposomal vitamin C is worth the extra money, and which forms are just markup. Read more...
Tired man rubbing his eyes in low light, drowsy after taking a supplement
Why your supplement makes you sleepy, not energised
Took a supplement and felt drowsy instead of energised? Here is what is actually happening, the common causes, and the fix. Read more...