Depends on one thing: how much you want in the tub besides protein. ISO FORM is three ingredients and the highest protein per serving. ISO ULTRA adds MCT and pectin for texture. ISO FAVA is the plant option. There's a full comparison on the Which Protein page.

Because those are two different measurements of the same thing. 2,500 mg is the weight of the whole magnesium glycinate compound. 275 mg is the elemental magnesium you actually absorb. Both numbers are on our panel; we lead with the smaller one because it's the meaningful one.

Take one, not both. NMN is a precursor the body uses to make NAD+; our NAD+ product is the coenzyme itself with quercetin and resveratrol alongside. There is no scientific consensus on which route is better — the human research on both is early, and any brand telling you otherwise is ahead of the evidence.

No. Loading gets you to full muscle saturation in about five days; skipping it gets you to the same place in three to four weeks. Same destination. The loading protocol is on the CREA PUR label because it's the manufacturer's direction, but one 5 g scoop daily works perfectly well.

We're not printing a testing claim until we can hand you the certificate that backs it. When that documentation is in place it will be published here and on the labels — not before. We'd rather have an empty space on the page than a claim we can't evidence.

Speak to your doctor first. Vitamin K interacts with warfarin and similar anticoagulants. This isn't a caution we're adding to be safe — it's a real, documented interaction.

ISO ULTRA and ISO FORM contain milk. ISO FAVA is plant-based. Every allergen statement is reproduced in full on the product page and printed on the label. If you have a specific sensitivity, read the complete ingredient list on the page before ordering.

Consult a physician first. That applies to every product we sell, and it's on every label.

United States only at present.

See Shipping & Returns for the full policy.

support@syntrexlabs.com. A person reads it.