Fireblood Blog — Supplement Science & Ingredient Guides

Coarse sea salt spilling from spoons on a dark surface
Electrolyte deficiency symptoms (and the salt myth)
Electrolyte deficiency symptoms are real, but sodium is rarely the cause. Here is what your body actually runs short on, and how to fix it. Read more...
Raw marbled beef steaks on a dark tray, a dietary source of taurine
Taurine: what it does and why your levels fall with age
Taurine is an amino acid your body makes less of as you age. What it does for your heart, brain and recovery, plus the daily dose that matters. Read more...
Assorted supplement pills spilling from a white bottle on a dark slate surface
Zinc bisglycinate vs zinc gluconate: which wins
Zinc bisglycinate absorbs better than zinc gluconate and is gentler on an empty stomach. Here's how the two forms compare and which to take daily. Read more...
Close-up of supplement pills and capsules on a dark surface
Mineral deficiency symptoms: the chart, by mineral
A mineral by mineral deficiency symptoms chart: magnesium, potassium, zinc, iodine, selenium, copper and calcium, and what each shortfall feels like. Read more...
Spilled multivitamin pills on a dark surface beside a white bottle
How much should a multivitamin cost?
How much should a multivitamin cost? The honest cost-per-ingredient math, why cheap multis use forms you cannot absorb, and what a fair price looks like. Read more...
What should a multivitamin contain? 5 missing nutrients
What should a multivitamin contain? 5 missing nutrients
Most multivitamins skip the same five nutrients: vitamin K2, iodine, choline, MSM, and amino acids. None of them are obscure. All of them have an evidence base. They get left... Read more...
Whole food multivitamin vs multivitamin: the truth
Whole food multivitamin vs multivitamin: the truth
A “whole food multivitamin” sounds like the upgrade. In practice, most of them use the same synthetic vitamins as everyone else, at smaller doses, with food powder added so the... Read more...
Chronic fatigue symptoms in men: 6 nutrient gaps to check
Chronic fatigue symptoms in men: 6 nutrient gaps to check
Chronic fatigue in men is rarely a single problem. It is usually four or five small ones stacked. Low vitamin D, low B12, depleted magnesium, a thyroid running slow, sleep... Read more...
Zinc to copper ratio: why supplementing zinc alone is a problem
Zinc to copper ratio: why supplementing zinc alone is a problem
Most zinc supplements leave out copper. Here is why the zinc to copper ratio matters and what the research shows. Read more...
Proprietary blends: what they hide on a supplement label
Proprietary blends: what they hide on a supplement label
A proprietary blend lists ingredients under one weight with no doses. Here is what that hides, why brands use it, and why our label has none. Read more...
Supplements while cutting: what actually matters
Supplements while cutting: what actually matters
Cutting calories cuts your micronutrient floor before it cuts fat. Here’s what a deficit depletes first, and what to do about it. Read more...
Fat-soluble vs water-soluble vitamins: what the difference actually changes
Fat-soluble vs water-soluble vitamins: what the difference actually changes
Fat-soluble vitamins (A, D, E, K) get stored in your body. Water-soluble ones (B, C) do not. Here is how that changes dosing, timing and absorption. Read more...