Well, that's a pretty vague question - but yes, if you take vitamin D3, you MUST take vitamin K2 with it. D3 "soaks up" calcium, but doesn't put it in the right places always, so a lot goes into arteries instead of bones. K2 is a "traffic cop" vitamin which is only recently come into the medical community. Here's a book on it: http://www.amazon.com/Vitamin-K2-Calcium-Paradox-Little-Known/dp/0062320041. My wife and I take 5,000 IU of D3 daily, and 400mg of vitamin K2. If you're confused about the K vitamins - vitamin K1 is the blood-clotting side, K2 is the calcium-directing side. I would never take D3 without K2. Hope that helps?

If this product is not, the Biotech Pharmacal - D3-5 (5,000 Iu) - 250 Count has stated that it is certified halal. It's the one I take and is available on amazon.

How big are these pills? I have trouble swallowing large pills.

the gel caps are about 3/8" long by 1/4" thick--quite small. They are "football-shaped," which also helps them go down easily, and gel caps are always easier to swallow than coated pills (at least for me). I have a friend who also has troubles swallowing large pills, and she takes these and is perfectly fine with them.

No, the NOW (tm) brand of vitamin D3 is made from lanolin (derived from sheep's wool), according to the label on my bottle, and is in a bovine gelcap. This product does increase lab results for Vitamin D3, which means it does work, but it is not at all vegan.

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NOW Foods Supplements, Vitamin D-3 5,000 IU, High Potency, Structural Support*, 240 Softgels

NOW Foods Supplements, Vitamin D-3 5,000 IU, High Potency, Structural Support*, 240 Softgels

4.8/5

Product ID: 1224678

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Details

Brand
NOW Foods
Item Form
Softgel
Primary Supplement Type
Vitamin D3
Diet Type
Halal Kosher
Flavor
Unflavored

✅GMP & 3rd-party tested

☀️5000 IU high potency

🛡️immune & bone support

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Description

☀️ Elevate your wellness game with the power of pure Vitamin D3!

PURE CLEAN FORMULA - Free from corn, dairy, soy, gluten, and certified Halal & Kosher for mindful consumption.
HERITAGE YOU CAN TRUST - Crafted in the USA by a family-owned company since 1968, blending tradition with innovation.
SUNSHINE POWERED STRENGTH - 5000 IU of highly absorbable Vitamin D3 in every softgel for peak daily support.
TRUSTED QUALITY ASSURANCE - A-rated GMP certified with ISO/IEC accredited lab testing ensures potency and purity.
IMMUNE STRUCTURAL SHIELD - Clinically backed to boost your immune defenses and maintain optimal bone density.*

NOW Foods Vitamin D-3 5,000 IU delivers a high-potency, liquid softgel formula designed to support immune health and bone mineral density. This non-GMO, allergen-conscious supplement is GMP certified and third-party tested for quality and potency, made in the USA by a trusted family-owned brand since 1968.